I have told my wife, if I lose my control, if I lose my mind, if I become an emotional burden, take our daughter, leave and do not look back. I tell her this now for if it happens, I may not recognise the signs. Perhaps I will adjust and improve, perhaps not but, demanding someone who loves me to stay and enable me by changing themselves, I cannot subject them to that, I can't condone that from myself.
There are people who should do exactly that but they are usually the ones who would never acknowledge it. Are you perhaps being a little too harsh on yourself?
But it's true that the world is full of more or less broken people. I actually agree that it would be for the best for many of them to stay out of relationships altogether. This is why I'm always telling young people to be very careful about who they get seriously involved with. For many, if not most, who are broken enough to not be able to have healthy relationships, it would be extremely hard if not impossible to overcome their problems. But fortunately there is an ever increasing multitude of distractions to replace actual human relationships. But they will be part of the solution and not the problem only so long as they do not interfere with parenting.