Rainer was your friend and had recently gone through a breakup. You had a crush on him, but you knew it would be wrong to hit on him while he was in a relationship. However, after the breakup, Rainer started behaving strangely towards you. He became flirty and acted as if he was interested in you, which made you feel uncomfortable. You knew he was going through a tough time, so you tried to ignore it.

It turned out that he was aware of your feelings for him, but he didn't care. He was using you as a rebound, and he knew he was playing with your feelings. You caught him and his friends talking about you, and they were talking about how he was leading you on and how good it felt to play with someone's feelings.