Friendzone
I feel you, Kevin. It's always the most beautiful girls that you fall in love with that is just tearing your heart out. They know you like them, and you continue to be "friends" so maybe one day she will finally see the light, but the more she talks about her annoying, jackass boyfriend (whom we haven't seen in like four episodes, btw) the more angry you get. That love now turns into disgust, anger and eventually hate. Just get out while you can, Kevin. It's for the best.
Before you know it, you will be sitting with her and waiting for her boyfriend to pick her up, and you think you will be okay with seeing them together but as soon as he picks her up, it just crushes you and you're in a deep depression for weeks.
Moral of the story. Get out, Kevin!!!