Sharing Our Innermost Thoughts

Okay so it was 3 years ago a boy in my college was so in love with me that everytime he used to irritate me by making lot of calls and messages in a day firstly I wasn’t okay with it because I had been really in a very bad relationship in my past like my best friend cheated on me with my boyfriend so I was almost on the level of depression and with so much of patience and struggle I came out of that phase so I was not ready for another relationship and that boy in my college was constantly forcing me to be in relationship with him but as time passed I began to know him and was loving all his efforts because all you crave for is love and attention and then we had our first kiss and after that we were in a relationship for almost a year but I don’t know where I went wrong I did everything for him like to support him all time in his studies but it didn’t make any change but this affected my grades. also I noticed one thing that the love and attention I got from him before the relationship was non existable after the relationship like he was more attracted to other girls.He didn’t even call me for 2-3 days didn’t even try to meet me for months. Wasn’t it so strange?. also we were on a trip where I needed him the most I was sick and I need someone to stay with me where he did insulted me infront of everyone and instead of staying with me he was chilling with his so called friends who did not even care a bit about him.Also he always denies to socialize me on his account but he always expects that I should socialize him everywhere. During covid I realised alot of things that he doesn’t need me anymore and So do I. But after several months I realised that I’m not able to move on after such a toxic relationship like I still crave for his attention and stalk him on every social sites.Now what should I do? Please help me out buddies!