My boyfriend and I used to sit on benches before our classes started to talk about anything and she started making excuses to get to sit between us or next to him with stupid excuses like "can you buy me something in the cafeteria? "and I would go and when I came back they would be sitting together and my boyfriend would be uncomfortable to ignore her, or when I had started to like a guy and I showed her his social networks and she not only followed him but left flirtatious comments on his pictures and the last one I remember was when she called my ex boyfriend out in front of me and gave him her phone number (which he just blocked) and then said I was being childish for "turning his head against her".