Told a LTR of 3 months that I'm staying over at a girl's dorm to study overnight. Hinted that we are "more than just friends", and that she has "made sexual advances on me", but that's she no threat to the relationship, and I have enough self-control to stop her.

This got her pissed/jealous. She made a scene. i told her afterwards that I will not tolerate this behavior (her lashing out), and she apologized immediately and promised it won't happen again.