What's up with this guy?

Ok so I have this friend. I know for a fact he doesn't like me because I know the girl he likes. Anyways a few weeks ago what happened was I told him in a round about way that I liked him. After that we were eating at Denny's (cause we always go there with our friends) and he said he doesn't like girls with earrings but he has to take them cause they're the only ones he can get ( I was wearing earrings.) The week after that he ignored me. Then he threw it in my face because my friend always pays for me whenever we hang out because I don't have a job and no money and he threw that in my face. Now mind you I haven't done anything to him at all. Anyways now recently over the past like 3 weeks he has been acting really flirty with me. First me and all my friends were at our friend's house for a movie marathon and he was there. He started leaning on me and touching me a hella lot. Then the next day he asked me to the movies. Then last week and this week he was touching me a lot like he hugged me from behind and he grabbed my arm and he was just being flirty. I am soooo confused because I know he likes this one other girl and he was being mean to me a few weeks before and so I don't know why he's started being so nice all of a sudden. Why is he being like this?