Nobody is endowed with the power to save somebody else. Your bf will not wither and die if you walk away. He may blame you for his emotional collapse if you pull the plug, but it's manipulation and nothing more.
You may be addicted to addicts, abusers, lunatics, and all sorts of terribly dysfunctional men. You are codependent. Your mission appears to be to fix, help, heal, and protect a-holes (at least that's what I've concluded from your "name"). Only YOU are endowed with the power to save yourself. Nobody else. Just you.
Potential is not the basis on which a functional, healthy relationship is built. Reality is. And right now, the reality of your situation is you are enabling him by "propping" him up. His reality is he doesn't want to work a program.
Do you want your child to be raised in the environment AS IT IS RIGHT NOW?