The main character falls in love with a hot chick whom he is helping to get through the senior year in high school (I think she was a friend with his sister, but I may be wrong), but then when he hopes he will finally move things forward he catches her having a threesome with 2 older latino guys. I remember that a while later he goes to the party and his friend offers him to get a revenge on her (by playing her) and the player gets the choice to either move on or to look for a pay back
Anyone?
Anyone?