Sharing Our Innermost Thoughts

this place is being so nice, so i am here, I want to vent out this thing, i am tired of hiding it now!
so approx. 4-5 months ago i got a msg in my instagram DM! i usually don’t reply but it was related to writing as i am a writer too i replied, he was so nice in nature, so kind and sincere, so then we talk, it was normal conversation and we came to know that we are in same degree (from different colleges obviously) and that’s how our first conversation was, then we didn’t talked at all, and then about 1 month ago he messaged me again! we talked very nicely, he was an introvert but too polite and talked about many things related to us! idk why i felt a different connection with him, like i already know him from so many years, it seemed like it was our reunion idk it was so special, it remain same for 2 days! then one night we were talking he asked for my number in very indirect way, i could have ignored it but i gave him my number (which i don’t usually do) then next night my parents were not at home and we were chatting and i came to know he is already in a relationship, that broke me a bit but like till then i was flirting him back but at that moment i stopped myself, he said don’t restrict yourself" i said “i don’t have limits, this can create problem” he said “it will not, there is only you and me here, will not talk about any one else, this is our small world” i agreed to him. then he asked for call, because i was home alone i agreed and we talked for like 2 hrs on call, heat of moment took us to the hight, but that vary moment made him uncomfortable and he said will talk later and left, idk that night i was so happy, next day i realized this is not good and msged him everything that whatever we are doing is not good and we are breaking someone indirectly, he didn’t replied to my texts and calls for 6 hrs. i blocked him from everywhere! after 15 days i unblocked him, he msged something and deleted i asked him what se said nothing and talked nicely that night (i was not angry at all) i was attached idk why and at the extend that i just can’t resist him! that night he asked for some good pictures of me smiling, i send, next 2 days went good after that i just couldn’t stop thinking about him so i msged him to talked about it and he just ignored the topic and was replying very rudely! i said him that “see i couldn’t do my assignments. i couldn’t attend classes, my scores are going down, please listen to me once”, but he replied very rudely that “how can you blame me, if you are not working its your fault, you are a filthy person, just go please, i don’t want to listen anything, just go” i left without saying a single word! i don’t hate him and he still gives me goosebumps when i look at his picture, idk what i am doing this, what should i do now, please give me some direction please :)