Crush?!!

I’m not too sure about him. I know I like him but I don’t know if he likes me. He would flirt with me for a day and then two or three days would go by and he would act as I didn’t exist. But now we just don’t talk or flirt or anything. It’s as if he just used me. It’s been 2 weeks that we haven’t talked to each other. And I’ve only texted him once before all of this happened. At first the conversation was good but then later on I was the one keeping the conversation going. I was the one ask question after question. Idk. But yea. Idk what i should do?? Should I ask him why he’s hasn’t talked to me or should I just forget about him?? I would really appreciate anyone’s advice with this problem