Boys make me sad

So I have had a really bad relationship that’s sort of really fucked up my life and the way I deal with relationships. I’ve been single for a long time now and I enjoy it a lot. I thought I could never have feelings for a boy again, but I’m sort of interested in this one. But the whole like, uncertainty of stuff like that makes me sad. Does he like me? Was he just using me because he wanted sex or something? Was he just bored? It upsets me a lot.