Is this behaviour normal?please help !!

(Sorry for my english)So i met this guy almost 3 months ago, Hes 18 and im 20...i should have known better i kno but...we had mutual friends so we all hang out for a little while and we ended up kissing one day...After that day he was very into me and all he would call me baby and stuff,he would call me to say he misses me all day long,he never tryed to get me in bed,he would come with he's friend to another house close to where i live and he would arrange to see me EVERY SINGLE day without me telling him anything.He had to leave for 13 days and every single day he texted me saying how much he misses me and how much he wanted to come back to be with me. When he did come back he was still amazing and i started to like him a lot and love everything abt him..I was feeling extremely comfortable with him and we were very sweet to each other.. then things changed. all of a sudden it was like things were getting more serious and we couldn't handle it...i wouldn't text him first he wouldn't talk to me then sb was makng the first move and we would talk again then it was starting all over again...he was getting jealous when other guys talked to me but he would never say it, i was always sending them away politely and go talk to him so he was getting over it and we were fine again.. He always was too scared to show me how he felt and me too.We started talking less and less but when we were in the same place we always ended up going home together. Im a virgin he knew that he didn't seem to bother and almost one month had passed since we first met.. A few weeks later we slept together we tryed to have sex and i felt like i wasn't ready he was ok we laughed we had a long talk abt a lot of stuff we kissed a lot like we always did and he would always look me in the eyes and hold me close to him and kiss me so soflty..i mean it felt so secure in hes arms he made me feel safe.. he said its ok i want you to do whatever you feel good with and i don't mind at all we cuddled and slept like that. After two days he showed up with another girl a friend of his friends, he does not talk to me and i dont either and he doesn't seem to care that i may be in the same place with him hes always with her. sometimes he looks at me and feels weird but i turn my head the other way..I tell all our friends it doesn't matter and all of them think im talkin with a few other guys and im always like " Its ok , i really think hes a nice person i dont hate him im 100% ok with him , it wasn't like we were together or smthing" BUT it hurts, A LOT. I feel so fucking stupid... When im around a group of people we both know, or his friends and hes there with the other girl i feel like i need to prove everyone im ok with it, and i do it quite well but i wannna go and fucking tell him that hes a huge asshole and that i fucking believed all the crap he said and that he could act like a fucking man and be honest with me. Am I wrong? What did i do wrong? What can i do now to feel better and confront him? WTF Im going crazy helppp.