What do i do?Why do you think he did this?Am i being unfair w/my bf?Should i ask him about what happened?

You are still only in HS. There are plenty of time ahead of you, so I'd say forget about Paul. He doesn't care.It seems to me that all he wants is..you-know-what. Just hang out with your current BF and try to avoid Paul. Soon, your feelings towards Paul will go away.