WHY DID MY CRUSH CHANGE FROM BEING SO NICE TO BEING SO IGNORANT TO ME? HELP

Okay so like weve been in college, in the same class since May 2015. But we only started talking on like October 2015. We got along great and he even admitted and said it to me and even others that we had a thing for each other and I know hes joking around so I went along with it. It was our scandal thing haha. And he became such a great guy, he would say Im pretty and would tell even girls from other colleges that we kinda like have athing. So like theres a scandal between me and him and which means like theres something going on between us but its just a rumour, so hes been calling me hisscandalsince like early this year. But we always laugh about that and just go with the flow. So then, I found myself liking this crush of mine more and more everyday. We had a trip once and at night when everyone was asleep on the bus. he came up to me and like wanna watch a movie on the laptop together. I was honestly blown away, I couldnt take my eyes off him. Even when I was taking selfies, he was at the back of the bus and without me telling him to, he was smiling and being such a cutie in every photo. Then on the last day of the trip was my birthday, he didnt talked much to me. I waited for him to wish me happy birthday and he didnt. He was so cold. He wouldnt even look at me or smile at me like he always do. It felt like he was ignoring me. A few days after that in class, I offered him a candy and asked if he was mad at me. And he took the candy and said its nothing and its all cool but I could see he wasnt that eager to have me around. Then a few days later was my 19th birthday party. I didnt invite personally. I just told the people at college about it and said all of them should come, the more the merrier. I honestly never expected him to come after what happened. And at the last minute, I found out he came and was like right at the door and yeahh I was all smiling like crazy. But he didnt talk much to me. He was on his phone almost the entire time. He didnt making taking photos with me. He accepted the cake and then while he was eating the cake, my other guy friend told him to like feed me the cake with the spoon. And he was like yeah sure. and I was like afraid hed smack that cake right in my face and was a lil reluctant. But then he was like okay then. Then I was like okay Ill take it, just dont do anything crazy. And out of nowhere he feed me the cake with the spoon. Twice. Because I was a lil shy to finish the cake in one go haha. And my friends were taking pictures of me. Lets just say my heart almost burst out or something. And I was like talking to my guy friend who was wishing me happy birthday and I was like pointing to my crush and was like, well now one more to go. Wonder why he hasnt wished me. And my guy friend went at him and was like why you havent wished her? And he was looking all serious and was like What? Whataya mean? I wished her happy birthday on her birthday on the trip. And I was like yeah right, I waited and I didnt hear you said that. And he was like I swear I did. And I was like okay then. When I got home, in our college chat group that has like 3 colleges combined I saw he posted a pic of him feeding me the cake with the spoon. The caption said like, happy bornday my friend, I did wish you happy birthday before, I guess you didnt hear me. Hope youll always be successful and have a long life. So since then he has been so cold and ignorant to me in class and even anywhere else I wanna cry. I wonder if Im still hisscandal. I admit he still makes my heart flutter. I just dont know why he changed. I miss him. I miss us. Why did this happen? What can I do? PLEASE HELP ME. THANKS SO MUCH EVERYONE. xoxo