Is this sexual assault or Harassment?

Ok so basically this happened in 8th grade and In currently in 10th grade but this always comes back to my mind and so there was this kid I was kinda friends with him and he was always known as the weird annoying kid and they always said he did inappropriate things to people and everything so one day I was walking to my moms car and he saw me and asked for my number and I thought he was just trying to become good friends with me even though I liked him as a friend but I agreed and gave it to him and whenever he would text me he would flirt and send hearts and say I love you and that kind of stuff which I thought was weird but I just went along with it and that was happening for a little bit and he would walk with me occasionally but nothing else really happened but then one night he said to me I have feelings for you and I didn’t like him that way so I said sorry let’s just be friends then the next day I saw him at school and just kept apologizing because I felt bad and whatever and then he kept saying I wish I could date you do you like me etc and I kept saying no then one day he kept bugging me about it and then I finally said I will date you even though I didn’t like him I felt forced to date him and he made me uncomfortable and everything. So then we start dating and I never wanted to but I said yes anyways after like a day of dating or so of dating he started following me to my classes and I couldn’t get away from him and we had gym together and we were playing whatever we wanted so I played four squares and he would follow me so I went to a different one he then followed me again. And he always went to one of my classes and pretended to be a student and it made me so uncomfortable that I would start crying in class and he would kiss me on the cheek one time we were walking to class and I had a hair in my face and then he moved it and tried to kiss me it looked like and he was getting in my personal business and then if I tried to talk to any guy friends he would be like why are you talking to them or what was it about and he tried to take me away from my friends where I couldn’t hangout with them. And because of him I was always getting in trouble and I was restricting my food and I had so much anxiety and I hated every second with him and he would hold my hand when I didn’t want to like I would move on purpose and then he would move closer to me and while this whole thing was going on I felt so alone and depressed because I looked happy but deep inside I wasn’t and I was having suicidal thoughts but nobody knew about it. And he dated one of my friends too and made her give him a handjob and did very bad stuff. But was this harassment? I haven’t told anyone about this and kept it all to myself because I’m scared to tell people only one person knows because she helped me through it because she went through the same thing with him so she knew what is was like. I only dated him for 4 weeks and those weeks were a living hell but it’s over and I’m in a better place. Oh one more thing when I broke up with him his ‘sister’ was like if you didn’t like him then why’d you date him and said I broke his heart and that I wasn’t a good person for it but whatever. And now every time I get into a relationship I get so much anxiety because I have a fear of this happening again.

Thank you for letting me rant and tell me if you have any advice for future relationships or if this was harassment.