Hi @Allysson and welcome to the forum,
It sounds like you are having a tough time at the moment, I just wanted to let you know you have been heard.
Unfortunatly there is no easy answer for you 😞 but I want to encourage you that reaching out here is a big step towards looking after yourself. Looking after yourself is equally improtant to looking after your boyfriend.
Do you have family or friends or a councillor that you can talk to about your fears and concerns and how to look after yourself while supporting your boyfriend? Unfortunaly you can only support him and encuurage him to get help, you can not make him better yourself. (If only it were that easy), he has to want to get help and follow advice.
I support my wife who lives with borderline personality disorder and major depression, we have been married for over 19 years so I have some understandig of how hard it can be to watch and wait while our loved ones seem to self destruct 😞
Sorry I don't think I have been much help but just wanted you to know you are not alone.