Some people are really stupid to think that they could make the person they love to love them back. I'm sorry that you had to go through such a painful experience with this dude. People like him are like annoying energizer bunnies "still going. Going!"
Back to the story, my friend said his girlfriend has been getting hit on by a guy. The guy is in their group. Even though he knew she and my friend are together, but he refused to accept that fact. He even said they're not married, so he has the right to win her heart. She's gotten quite annoyed with him; on the other hand, she kinda likes the attention.
I hate people who hit on other people's boyfriend/girlfriend with the excuse, "they're not married, so I have the right to compete." It's so unethical to me.