I’ve had the same, treat you like crap but you can’t tell anyone what you’re going through because he doesn’t like it. It’s guilt.
Honestly, I’d go to your parents even if it is abroad. Go and be happy. You only get one life, and if you are anything like me, you’re thinking, if only I can fix him, I don’t want him to get worse if I go.
It’s not your fault. He’s not your responsibility, your happiness is paramount. Unless he stops using, you’ll be on this rollercoaster of emotions for too long.
Here anytime you need to talk x