Help me find a manga.

This is like a distant memory at this point so imma try my best. I thinkk it was shounen ai or something. There was this dude and his girlfriend at first i think. They were under a bridge and they were attack and he helps her. He get dragged into fighting and gang bull. Meets a guy and like him???? I remember the girl gets raped. Ooooh and she start to dress more masculine after her assault. The dude had a motorcycle. It was older style manga i think. I just want to know if it was complete, i dont remember how it ended. If this seem familiar, pls help..