What he's saying sounds like she was really trying to fight for a 10 year relationship, and look, not saying that they should have stayed together but, she was trying, mentioned the embryos, trips, counselling etc. He had checked out but never bothered to tell her, probably hoping she'd just give up and break up with him. They had a house together, if he wanted to end it, there are legal ramifications and steps to be taken. He had done none of this which tells me he's lying through his teeth and trying to make out they had broken up.
If he wanted to end it, then end it. Don't shag around with her mate for over 7 months, lie about it and then try to throw her under the bus as some sort of unhinged manipulative harpy, in a bid to make yourself look more sympathetic.