Emotional and always angry at me

So my now boyfriend and I met when I was a freshman in high school. I’m a junior now and he’s 18 about to be 19. We were unofficially dating for four months and he told me he was moving to a different country. He told me to let him go and told me I meant nothing to him at all. Last month, he came back after 8 months and began apologizing and we finally got together. My friends tell me I’m stupid, but he was the first guy I ever loved.

There’s a bit of an issue though.

It started about two weeks ago when he started getting very emotional and angry. He keeps snapping on my because I go to work and can’t talk at that moment. He feels as if he’s not my priority when I constantly put him first. The other day he told me that he doesn’t trust me not to cheat on him when he goes back to his country and snapped on me because when he was gone I moved on six months after he left (It took me a while to get over him). He gets angry whenever I hang out with my guy friends and gets even angrier when I call someone else instead of him. After being a dick, he apologizes immediately and begins telling me how much he wants to marry me after I graduate. Then the next day it’s the same thing. What do I do? I don’t want to end things with him, but I literally have nothing else to say to him because I try and tell him I only want him. I try to make things right, but it’s complicated. Now he wants to start being sexual, but I’m scared he’s going to leave me afterwards. Any advice?