First, I hear that there is a lot of stress in this relationship and it seems that the communication is fraught with stress, anxiety and fears. I think I'd have to ask myself what qualities I want in a relationship and whether these qualities are occurring here.
Second, any way you cut it, if the relationship continues, there will be a cost to one parent's child(ren). What impact is that going to have on them and what kind of efforts are going to be made to minimise this?
By and large, I'd agree with the input of most people here. Good luck with the decisions you have to make.
