We got into a huge argument because he was talking to other women and now he doesn't even want to be friends. I know I should let things cool off but I wonder if this relationship is even worth it.
See for me, I would nip this in the bud and say along the lines:
"if you don't want to be friends because you want to talk to other women, then I realize that is more important to you than this relationship".
"i want to be with someone who takes my feelings into account, just like I do with you"
"I thought you were that person, that is what I try to be for you"
That's how I would leave it. It would be a boundary for me.
But this is you, and you have decide where your boundaries sit. Since you had a fight, this sounds important to you.
And with your latest posts, it is very common for them to switch to addictions as the relationship progresses.
This helps they 'self-medicate' their illness. In the beginning it was all roses and perfect so the substance abuse might not happen till later.
My ex was the exact same way.
The hard part is making sure you don't give up too much of yourself.
When to draw the line and what is worth it.
It is a fine balancing act and you need tons of support.
For me it was too difficult (my support system was weak at the time).
But I think with the right outlets it might work.