New to this. Is it really MLC or just an affair?

[Lone77]

I have distanced myself. I do not contact him and also refused to answer his telephone calls. I've already been to a lawyer for financial purposes, although in all fairness this has not been an issue so far and he continues to pay the mortgage and bills etc beyond our proportionate split.
My D is obviously very upset/angry and as H will not give her the opportunity to have her say (they always go somewhere public after the time he took her to the apartment very soon after moving out which went horribly wrong), she is still bottling it. She does speak to me a lot although I will not tell her what to do, the advice I give is to think about what she wants and how she alone will feel if she does/doesn't do or says/doesn't say something. He used to dote on her and she on him, that's heartbreaking to see and it clearly affects her. She does have frequent occasions where she doesn't want to see him or won't reply to texts. Currently it's been 3 weeks and 2 days since she last saw him.
She and I have built upon our relationship however, we've been on 3 different holidays in the last 7 months and have another 2 booked. We do lots of things together without inviting H and just get on with things as just the 2 of us.
I won't start any legal action until after her high school exams, she's already had so much pressure and there has been a significant impact on her schooling, she wasn't attending and has gone from being a high performer to concerns as to whether she'd be permitted to sit her examinations. I can't do anything that will make things even more unsettled for her until she's completed the school year in June.

This time last year I would never have seen this coming, H was prone to being stressed and has a high pressure job which D and I both saw as being the issue initially. He'd even commented to one of our friends 2 months before BD that he couldn't wait for a project he was working on to be over, that I had been amazing, he could not have done it without me and couldn't wait to get time back with me again. From that to BD within weeks!

Whilst I'd rather none of us go through it, I'm glad I'm not alone. Within my friendship circle I'm the first (and hopefully the last) who has experienced this, whilst my friends have been fantastic I don't think you fully understand it unless you've actually lived it