I had a chat (via email) with my SIL last night. She understands why I want him back but thinks he's made up his mind. I told her my side of the story and why I think it was so sudden. She also admitted that she didn't know who her brother was anymore - which most of his friends agree with too - he's in a major fantasy world at present - doesn't really want to talk to any of his old friends, his kids etc.
The OW does have a daughter - but she seems to be palmed off at her dad's or her grandma's most of the time. Yes it is easy to be all romantic etc when life doesn't get in the way. He doesn't remember once before kids (and we were together for 8 years before having kids) that we were like that too!
He's coming to pick the kids up tomorrow - I still don't know whether to contact to be distant and unemotional, or to be friendly, ask him if he wants a coffee, ask him for some advice on a computer problem I have (he works in IT). Last time he was here I was very distant.
H 34, W 36 T 13.5 M 8.5 C 6yo twins S 6/5/11 OW 7/6/11 OW moves in 9/18/11