I need your opinion!

OKAY! So there's this guy I've been friends with since Kindergarten. We went to the same schools all of our childhood. Elementary, Middle and graduated HS together. We've always had a thing for eachother, messed around but never took it there because of how good friends we are. I have a cousin who moved into town when we were in middle school. They were in a relationship for like 2 years. We're all cool. During their relationship he always came at me, flirted, etc. I flirted back of course because we did like eachother. We've always had a thing. They broke up our Sophomore year. My cousin moved and ended up getting into a new relationship. They've been done for 3 years and counting. Me and him remained friends still but now we're in a relationship. What do you think?????! How would you feel? Am I wrong? I don't feel wrong. She's one of those cousins that dates all your exes. I knew him first, we've always had a strong bond.