This was me 10 weeks ago (minus the pregnancy).
As predicted by many people he did have someone else and it wasn't just the dating site that was the problem.
And also as predicted by many, he was back after 6 weeks in tears crying and begging me to take him back, desperate to be friends at least...
I told him I was just embarrassed that I'd married someone so lacking in imagination that strangers on the internet accurately predicted everything he went on to say/do/reveal.
My ex was also my best friend and the only person I'd ever really trusted.
He's had a breakdown and is now in counselling because he can't cope with what he's done. He misses his children, claims to miss me, has lost respect at work, is back living with his parents...
Me? Well I have a few weeks of hell where (as also predicted by people on here) I cried on the school secretary, my friend's dad, the GP (three times in a month), someone who runs an activity my son attends...
But now? Well I'm applying for new jobs, I've forced myself to make some friends, I go out a couple of times a week. I really enjoy the time I spend alone when the children are with their dad and I'm starting to make plans for the future.
It's early days and there are still days I when I feel like I can't face getting up and I'm terribly sad and lonely. But most of the time, I'm fine.
I found it easier to do the 'being friends' bit to begin with but now, I'm content with being civil. He isn't the person I married, or the person I thought he was, or the person I was friends with at school. He spent a lot of time saying "but you know me. You've known me for 20 years. You know the sort of person I am" and I just had to tell him that I had thought I did, but I was clearly wrong because the person I'd been friends with at school and the person I'd married would have never done this.
And the children?
Well the children miss the dad they had, but my eldest (14) is very unforgiving. And the 3 of us are now a team. A team that no one, but no one will ever hurt again.
Good luck. x