I Don't Get It.....

Sometimes I wonder about people....I have an acquaintance/friend I will call Q. He is with the mother of his child currently. I will call her Z. Their relationship is stormy at the best of times. They have both had their problems, both mental and physical, as well as addiction. Personally, I think the best thing for Q is to totally call it quits with Z, figure out visitation/custody of the child, and move on with his life. Z has mood swings that shift from minute to minute, or that's how it appears to me. Although I could be wrong. I barely know Z. But I can see enough, that I think that Q would be better off without Z. He says that it is over between them (or has said it), but it seems they are sort-of, kind of, maybe/maybe not together again. Q is a decent looking guy (all I can say, coming from a hetero point of view). Maybe he feels that she is the best he can do? I understand that he loves Z, but sometimes you can't be a rescuer. I guess sometimes you can't figure out the power some people hold over other people, and that there are different forms of being addicted, not just drugs or alcohol. But Q and Z are both adults, and although my partner has known Q almost forever and is very fond of him, I think both her and I realize that you have to let people live their lives and make mistakes. Dealing with other people's stress and problems just brings it into your own life. Hopefully, Q and Z can figure out something that works for them, and they can get the help they need and move on. I guess the main point here is for them to clean up, smarten up, and try and be good parents for their young one.