Was this sexual assault?

I used to hook up with this guy in my dorm. We lived on the same floor and it was okay. Then I decided I wanted to stop and he turned kind of creepy. He would leave about 40 origami birds on my bed when I went away for the weekend and would always show up at my room. He would always try to figure out where I was and go there. He would go through my Instagram and try to figure out who the guys were and interrogate home about it. We kind of hooked up in and off randomly and after every time I would cry. I don’t know why. I just felt gross. But when I wanted to stop, he didn’t. He would come to my door drunk or high and try to stay over when my roommate wasn’t there. He would yell at me. Tell me how much I hurt him and how he loved me. Then one day he came over (had questions about a uni thing) and he was sitting next to me. He started putting his hands in my thighs and kissing my neck and I told him to stop and pushed his arms but he kept going. He pulled my hair back and started kissing my neck and I kept trying to move and told him to stop. When I tried to move forward he pulled my by my hair backwards (not wicked hard) Then he somehow managed to get in top of me and push me down and tried to kiss down my neck and rubbed against me over my pants with his fingers. Nothing penetration happened because he finally stopped but does this count as assault? He left after and I just started bawling my eyes out. I would say no but I would also like laugh uncomfortable because I didn’t know what else to do and laughing for me is something I do to diffuse a situation. Or am I over reacting??