I (20M) am a university student and was preparing for the exams with my friends last summer. The friend group consists 6 people and 3 of them know each other from high school. During this study period, a girl (21) (let's say Kate) that is their friend from high school but wasn't around too much since she studies different subject at a different building. After 1-2 days she started to hang out with us, one of the girls (20) (Sarah) that knows her from the high school and that is also someone I consider a good friend started to talk to me privately about how good we look together. I was very busy in that period so I said that I'm not interested in her. Even though I said that several times, she continued to tell these stuff and went even further talk about this in public. This happened nearly everyday for a month. I think it wouldn't happen if Kate wasn't happy about it. However, I said "no" and "I'm not interested" at first and kept this stan...