Oh the irony of most of the recent posts! 
Instead of some of you answering the OP's question and being brave enough to admit that you have been in her shoes too (the immortal words of Mandy Rice-Davies come to mind), it has turned into a thread complaining about bullying and judgemental posters, then into both thinly veiled and transparent attacks on other Mumsnetters - in fact the sort of cowardly, bullying behaviour of which you complain.
And given that on your recent thread deburca about your friend who was recovering from her husband's affair, aislinggorla piled in to accuse you of being the OW and of lying on your thread - something I never once did on my response to you in that thread - you have some pretty strange bedfellows here.
You know, if you stood back and accurately recalled the threads about affairs and infidelity, you would see a different picture. You will see threads where OW and OM are treated with understanding and compassion - and my oft repeated mantra of "good people do bad things". You will see threads from women and men who have had affairs, who will receive support in trying to stop behaviour that is damaging them, as well as others. You will see lots of support for people trying to recover from the pain of infidelity - pain that some of you seek to deny even exists. You will see advice urging posters not to vilify the OW, to the exclusion of her H - and a sizeable proportion of posters expressing beliefs that the OW is not to blame at all.
It's true that you will rarely get support from Mumsnetters for defending the right to deceive and lie, or much understanding about why anyone with integrity wouldn't regret at least those aspects of their affair, if not the experience overall. Because infidelity is multi-faceted. Unlike strawberry's assertion that is simply about sex with someone else, it involves far more than that. At the bare minimum, it requires a person to lie, deceive and live a life of dishonesty. It sometimes also means colluding in a stranger and his/her family's pain, if the affair is with another attached person.
The person who doesn't even regret that, even if with hindsight they can say that the affair propelled them out of an abusive or unhappy situation, is clearly vulnerable to doing it again and unlikely to get waves of support from people with rather more integrity.