Long story short, I'm hooking up with this girl, and it so happens that I hooked with her best friend around six month ago. She's giving me textbook shit-tests like "I don't know if we can keep hooking up" and things like "Out of people, her really?" I'll admit I lost a bit of frame, but we've still hooked up a few times since then. She's still giving me shit for it though.

What's the best way to deal with this?