This 'friend' is the mother of my son's closest friend. She's someone I will have to see every day on the school run. She's also probably the person I socialised with the most; drinks, nights out, coffee together. I would have considered her my closest friend here (we only moved to the area 3 years ago).
Apparently they only slept together on two occasions but they've been sending explicit texts every other day or so. This has been going on for nearly a year.
Her husband found some texts and confronted her, leading my husband to telling me. I told him that he was only doing so because he'd been found out, he disagreed and said he was going to tell me but (and I shit you not) 'I didn't want to spoil your birthday'.
Our marriage has been bad for a long time but I thought we were working on it. I have been very bad in my behaviour to him too - I had a drunken ONS (didn't actually have sex but did everything else) in the spring. The difference was that I immediately confessed, did everything I could in my power to make amends, stopped drinking, went to counselling, suggested marriage counselling (DH refused, said it was a waste of time, now I know why). He made me feel like a terrible person (which of course I was) and ALL THE TIME he was exchanging sexy texts with someone I thought was my friend and he'd already slept with her months before this happened.
DH is distraught, contrite, wants to do everything he can to make it work. I don't see how I can ever get past this, to be honest. I don't feel as if I will ever trust anyone again. Her betrayal hurts almost as badly as his. How could they do this to their children?