Hi
I have read your
first post, and I see you both have a young baby. That brings more tension.
Do you frequently argue with him about his "almost cheating" behavior? Do you get angry? You have all of the right to be angry at that, but I'm asking because if you feed into the drama, it will make the behavior worse.
To be honest, I think things will only improve if he loses access to you as a consequence for this behavior. For instance, you could move away to a parent's house for a while. Or perhaps you could do it permanently. But it's important that the consequence does not feed into the drama, so you would need to cut off all contact with him and have someone else deal with him and his requests. Maybe someone else would request him to leave your house so that you can return.
The idea is that once you are not living together, you'll finally be able to have peace and set boundaries that protect your peace, so you'll be able to provide love while ignoring his drama, so he won't be able to force the drama onto you, and if that's accomplished, then gradually his recent drama should be reversed (settled down to the level it was in the beginning).
Otherwise, you'd have to go into an open relationship, perhaps one-sided. But I don't think you want that, and I don't think it would really end the drama.