Hi worried sister, welcome to the forum.
I’ve read your story, and knowing what I do about being around my addictive son, in my opinion i would get out of this relationship before you’re in too deep. The addiction will consume his life and yours, he will choose it over you every time.
I’m sorry to be blunt but if you were my daughter I would not want this future for you.
I think in your heart of hearts you know being with him is a bad idea.
The fact you’re checking his phone proves you already don’t trust him.
That’s only my opinion, of course the choice is yours .
I’ve read too many stories here with people who have partners who choose addiction over them.
I guess you need to choose what your heart tells you or your head.
I wish you all the best,
Lx