What does it mean when a girl flirts with you but she has a boyfriend. Does that mean she cheats on her boyfriends?

I think it's easy to look at flirting as not cheating but the one thing you can't get around is that it's selfish and disrespectful. There's no way around that part. I've done the same thing and try to validate it just because I had no real attraction for the guy and only wanted attention but I still put myself before my boyfriends feelings and I'm lucky and blessed he still wants to work it out with me. People please don't hurt those you love the way I did. It's sickening.