As you know my H did a complete about turn on Sunday just gone and I haven't been on the board as trying to get private computer time with him and 2 kids in the house isn't easy. What I did, and I like to think it contributed to his complete change of heart if not made it completely was remove myself as his safe place completely. He has told me that even when with her and in the throws of it all there were many times when he wanted to call me or text me about something but couldn't because I wasn't available to him even as a friend any more. The holiday he had with OW made him realise he would have much rather been on holiday with me as I am his best friend or me and the kids.
I'm not trying to hijack but I think you have been far to nice and accommodating with her and you need to get out there and not treat her with contempt but do exactly as you say, kids and logistics of the kids and finances if required and that's it, keep it business like. But also and most importantly get out there and do things for you even if it's just visiting a friend. My H thought I was out partying regularly but really I was at friends houses some of the time, still having fun, sometimes talking about him and sitch and sometimes upset but he didn't know that and again he said it was killing him not knowing where I was, what I was doing or who with.
Take care SJ
Me 46 H 39 M 11 T 14 S 10 DO 8 ILYBNILWY 11.06.17 Separate rooms 11.06.17 ILW OW A ongoing 12.06.17 Kicked H out 23.6.17 H came home 20.8.17