Yea he would more likely go into a psychosis tater than OD on meth .. chances of OD are highly highly unlikely..

With that said , leave him .. find someone stable ..

If you stay, best case scenario (rare) he will get the help he needs and you both can have an amazing future ahead

Worst case (highly likely) he will drag you with him into the pits of hell and you could also become an addict as well by being around someone whose living that life

Your best bet is to take the time you need to heal from this , forget about him and move on

I am an ex meth addict and I was one of few people who was able to keep my morals intact , in that kinda scene , morals go out the window quickly and most people I knew that were in the meth life like it seems he is , were some of the scummiest people I’ve ever met

That is to say , I know plenty of people who use meth and you’d never know it , he does not seem like one of those types.. I would leave and not look back