The exact monologue after he stops kissing her because she's crying and saying "I cant" are...
"At the time I couldn't understand Bella. The attraction was there, but for her it felt so wrong. I remember feeling bad about kissing a married woman. I figured she felt the same since she was being unfaithful to her husband... which, of course, is a very big deal. But if I had known the real reason to her tears... to her persona... I wouldn't have kissed her that night. I would have called out for help."
So whatever this "real reason" happens to be is the crux of the matter. Can't say why what he did was so bad but his monologue seems to imply it wasn't the infidelity that was the issue but something bigger.
I feel like the "real reason" could be to do with Jill's sister.
This is a theory I posted back in May.
New theory: Bella's protective nature of Jill isn't just because she was friends with her late sister, but because Bella feels somehow responsible for her death and is trying assuage her guilty conscience by looking after Jill.
Bella's guilt also created problems in her marriage causing her husband to cheat on her and they decided to "take a break" for a while, but it went from a short break to 3 years. Bella has since forgiven him as she realises she drove him to it and has reached out to him to ask him to come back so they can resolve things properly.
If Bella does feel guilty for Jill's sister's death, this would certainly explain her tears because she knows that Jill likes the MC and earlier that day she basically encouraged Jill to pursue something with him, and now she's making out with that very person. Feeling somehow responsible for her sister's death and then making out with the guy she likes would feel like a massive betrayal for Bella.
However, the only flaw in that theory are the scenes in ep 4 if you stay with her and in ep 5, because if she really felt that bad about the kiss for this reason, she wouldn't do these things in eps 4 and 5. But even without that theory, it still feels like a quick turnaround that literally a day after she cried her eyes out over a kiss, she basically beckons him into the bathroom for some heavy petting.
Her actions so far are a little inconsistant, but hopefully there's a good explanation for it eventually.
I did go for the trio relationship, but for me it still feels like it might be a mistake due to it maybe being forced, i.e. you either get everything or nothing
Well, I want the "everything" so I don't much care if it is forced or not. I still favour Maya more than Josy, but I'd rather have both than just one of them.