School and boys

So I go to a small school in the middle of nowhere. I like this guy and we are close but not like bffs. He asked my brother if he could be his brother-in-law and my brother wasn’t thrilled about the question. Anyways he talks to me and then the next minute he flirts with someone else. What do I do? He is literally the nicest guy. Every time I see him smile it makes the world disappear. I know love isn’t all sunshine and rainbows. Also so much freaking drama at school, this girl is talking crap on everyone but then is all buddy buddy with them.