K-Fed's reportedly done it - as has Brad, Justin, Beckham and Prescott if you believe what you read in the papers - and cricketer Shane Warne has done it so many times, his ex-wife Simone has had to suffer the ignominy more than most.

Not just one, not just two, but a whole series of infidelities and scandals - ranging from affairs with a married stripper to raunchy texts and photos sent to younger women - has rocked not only the Warnes' marriage, but Shane's career - resulting in him being stripped of both his marital status and the Australian vice-captaincy.

But Simone took him back again and again - finally admitting defeat last week after Shane, who spent months wooing her back, allegedly sent her a text meant for another woman.

If you think she's mad to have tried so many times to get her leopard to change his spots, think again: deciding whether to give your man the boot or another go requires some serious thinking.

What actually happened?

So you discovered he cheated - but have you stopped screaming long enough to find out when, why or how? "The number one mistake women make when they're hurt is to immediately react - to throw him out and throw his clothes after him and scream and shout," says Christel Buss-Twachtmann, couples psychotherapist at the Tavistock Centre for Couple Relationships.

"Take things slowly and gather as many facts as you can to get a sense of how things happened," advises relationship psychotherapist Paula Hall. "Was it a one-off online indiscretion which he didn't mean anything by, or has he been sleeping with your best friend for the past 10 years?"

Is this a threat to your future relationship?

Depending on what happened, determine where you draw the line. "What's the long-term emotional impact?" asks Buss-Twachtmann. "Has he found someone else he's in love with or was this just a one-off?

"Look at when it started, what was going on in your marriage at that point," she continues. "Does he want to leave you but hasn't the guts to tell you, or does he desperately want you but finds something else in the affair that he doesn't have with you?

"I've seen a lot of affairs happen because the 'secret' was more enticing than the person they had it with," she adds.

Is he willing to talk openly about it?

"Can your partner tell you why it happened and what it means?" asks Buss-Twachtmann. "If they say 'I've hated you for the past five years', it takes you in one direction, but if they say 'I was lonely and they came on to me', then you have a different affair."

"It's important to have a third party, a trusted friend or a counsellor, who can help you gain a full understanding of why it happened in the first place," agrees Hall. "You'll have a lot more trust about it not happening to you again if you understand it."

Is this a deal breaker for you?

Contemplate what he's told you, and think about his reasons. If you yourself have cheated, what did it mean to you, and why did you do it?

"Women find it hard to understand that men are psychologically and biologically different to us," says Buss-Twachtmann. "We think that because sex means love for us, the meaning is the same for the man. It isn't necessarily."

"How good was your relationship in the first place?" asks Hall. "For some people, an affair isn't that devastating. It just highlights how bad the relationship had got."

What does the affair say to you about your relationship?

"Is it a sign that your relationship hasn't been brilliant, that you haven't been getting along well?" asks Buss-Twachtmann. "Is this a wake-up call that something is seriously wrong?"

Instead of pointing the finger entirely at your devious man, think about your own role in what's happened, suggests Hall: "Ask yourself, 'What happened in this relationship to allow this affair, and what kind of a role did I play in it? What could I have done differently?'"

How will it impact your family?

"If there are children involved, you don't have the freedom to just act out of anger," explains Buss-Twachtmann. "You have to take the time to talk through things. Even if you separate, you're still parents."

"Don't do anything that might damage the relationship your child has with their father," warns Hall, author of Help Your Children Cope with Your Divorce [Vermilion, £8.99]. "He might be the biggest cheat, but he could also be a loving and devoted parent who needs a good relationship with his child."

What are the benefits of staying?

"Ask yourself, why you would want to stay? Is it because you're afraid you might not find someone else or you're scared of being alone?" asks Hall.

"If you're staying out of fear of the alternatives, that's not a good reason to stay. Stay because there's enough love left, enough good left (between you), because you're good parents together."

What do you want out of this relationship?

You don't have to either stay with him or leave him - the highly under-considered option is always waiting.

"Say, 'Right, I'm going to stay for 12 months to give him another chance: it fits in with the kids' education, it gets my career off the ground, it works into my schedule right now'," advises Hall.

"You don't have to make that decision - of staying or leaving - immediately. You have more time than you think."

Could you trust him again?

Simone has said she always knew that Shane would go back to his devious ways, but sometimes a leopard can change his spots - if he wants to.

"How much genuine remorse and regret has he shown?" questions Hall. "You need to see actions that genuinely show he's trying to change: spending more time at home, allowing himself to be totally accountable - having his mobile checked, leaving his passwords open, giving you lots of reassurance.

"An affair is usually a symptom of a problem within the relationship," she adds, "but is there anything within him that explains his behaviour other than that, like a history of abuse or sexual compulsion?"

Will you be able to forgive?

"If you're going to move on together or apart, it is really important to let go of the anger," advises Hall. "It doesn't mean what happened was OK, but letting go of the anger for your own sake - and that of your kids - will prevent damaging the relationship with the other parent.

"It's a long process that takes some work every day as anger has a way of just creeping back in. But it's about looking forward - not backwards, and choosing to let go for yourself.

"If you don't let go of it, it leaks out in other ways, in stupid bitter quarrels over what time he said he was going to pick up the kids."