What does it mean when a guy mate guards in public from my advances but the girl seems to eat it up and defend him?

He was visibly butthurt and coming at me verbally. But she didn't seem to mind and instead looked like she loved it.

I wouldn't have hit on her if I knew he was the boyfriend, I don't care for that sort of bullshit. I disengaged. I felt like a fucking chump.

Low SMV on my part? Should I get aggressive with shitheads like that?

Anybody able to give me some insight here? Thank you.

Edit: The only reason I'm here to ask is because everything I read on TRP is about "agree and amplify" "ignore" and "amused mastery" but my gut wanted to square up with this guy.