Is it normal that he changed?

My boyfriend and I have been together for nine months. Before that we had went out before.. For three months and he didn't wanna go out with me anymore because really he just wanted to get in my pants. Two years went by and that's when we went out again. He wasn't a virgin and I was.. He was telling me like the first couple months that I didn't have to have sex with him. He said the first time we dated he was young, and didn't know what he wanted. Like our four month together I had sex with him.. And since then he's changed like he used to text me sweet things and smiley faces galore and now it's far from that. I always have to baby him when he gets mad at me and when I get mad at him, he just gets more mad at me and wants to leave.. I buy him little gifts every now an then and I don't receive any from him. He always counts on me to ask him to hang out. He picks on me once in a while.. And he gets me sad. Sometimes he'll pick out flaws of mine also. I like him a lot.. But what do I do? I feel like I do everything and he just kicks it.. -____-