Should I be concerned?

My boyfriend has been making comments when we're in class that make me think he might be gay. He even told me today that he had dream about him dating me and a guy. I'm 16 and this is my first ever relationship. I've been dating him for almost 4 months and I really do like him. Should I be concerned? I don't want to hurt his feelings by asking him if he might be gay, but I don't want to be in a relationship if he doesn't really like me.