The only thing that should make you want to stay is the quality of the relationship, identifying something salvagable, and working from there...

From your post, it doesn't sound like anything worth saving at all.
I would listen to my family / friends, and cut my losses and leave...

Should I ever routinely treat my bf the way yours treats you, I would hope he'd have the good sense to walk away and not make excuses for me because I have bipolar.
Nobody deserves to be treated in such a disgusting and disrespectful manner.

There are people who will accept all of you, people who will be willing to leave your past behind you, bloody hell, there are people who wouldn't even bring it up. Instead you try to make it work with this fool who "makes you" delete YOUR accounts and change YOUR number, and yet he doesn't enforce any repercussions for his own behaviour.

What did he give up or change for betraying you?

Or is lying to you, and throwing you out while you're crying and needing his reassurance not betrayal??

People treat stray dogs better than that!!

Instead of worrying that he'll find someone better than you, I think you should go out and find someone better FOR you. God knows there are better men out there (bipolar or not) and you dear deserve better.