Does my boyfriend love me? Is this not normal or am I crazy?

This is going to be long...

We've been dating for a little over 4 months. He's really poor so he never buys me anything and we never go out and do stuff, but I'm poor too, yet he still asks me to buy him food and stuff that he needs from my work and give him gas money. He never gave me a present for my birthday but he said he would later. Well it's been a month since my birthday. He hates dances so when we went to a dance together he didn't dance with me, he talked to friends while I danced with my friends. He didn't take me to prom. He always tells me about other girls hitting on him and how girls in movies are cute. We fought about that after he said a girl in a movie was cute and I told him about my insecurities, saying I felt like I was ugly and he could do better then me and his response was "you said that, not me. I'm here to pick you up when you fall, not hold your hand when you walk" which I don't know what that means. He used to say really really romantic things, now the most romantic he gets is "good morning beautiful". I really love him but I'm scared he doesn't really love me and he feels sick of me. He makes me really aware of the fact that other girls come on to him and when he sees his friends who are girls at school he says "hey cutie" or "hey sexy" to them but he doesn't say that to me ever. And when we fight I always end up apologizing, whether he started it or I did. When I get upset with him he turns it around and makes it my fault. And whenever i do get upset, all i want is for him to hug me and say he's sorry and ill be happy. Instead he makes it worse. I feel like he's putting me down instead of making me feel good. Also, he threatens to break up with me a lot, but he told me he's not serious when he says that, he just says it to scare me and to make me stop fighting. He would never cheat on me and he says he wants to marry me someday, but it seems like we're always either fighting, or making out. Is he using me? He is my first boyfriend.