Help me !!

I really really really need your help !!

My bf goes to college and he has really long school days, and lately the schooldays have been getting longer and longer and the work has becoming harder and harder (I think), and that makes him very very tired. So, after school is over he sleeps.

In the beginning when we started dating his school wasn't a problem at all, but now we barely talk and he just sleeps and goes to school. Idk, maybe it's the time of the year were school just gets more and harder, idk, I dropped outta school. 

But now we barely talk or call and he's tired and also is colder prob cuz he's tired..

I already tried to talk abt it with him, but idk.. that didn't really go that well since he takes really long to respond cuz of school.

I also call him a lot at random times cuz he doesn't respond and I just really really miss him, and most of the time he doesn't pick up. I know it's annoying but I just get really worried.

Today I also called him and he didn't pick up and texted me: "Lemme sleep 🫩✌🏻"

I texted him I'm sorry for being so egocentric and pressuring him and that I don't mean to annoy him or pressure him.

I apologize a lot btw

What do I do?

I also have extreme anxious attachment and abandonment issues and I overthink 24/7 so I'm gonna lose my mind if ts doesn't change :(