It does sound like you are being drained by this relationship and I completely support your decision to break up. Not that you ever needed my approval for anything. You have explored every option to stay together, whereas he is not putting in equal effort. It also seems like he no longer shows an interest in taking care of himself, and if he can't do that, he certainly can't take care of you or you him. The fact that he went off his medications and didn't continue with any sort of therapy leads me to believe he's not ready to take charge of his actions. Also, I agree about the phone issues happening more than just once.

I hope I never came off in a rude or simplifying way. I'm just a hopeless romantic and idealist at heart; they tend to get in the way I think you have a good plan. You are the most important person in your life and you have to take care of you first and foremost.