Painful as it is, the solution is simple. Hire a lawyer and when you find out who her boyfriend is don't beat him up (although I can tell you it is satisfying).

Down the road, when she comes back and asks for a second chance, get a hummer before you tell her no. It will make for pleasant memories in the future.

He who joyfully marches in rank and file has already earned my contempt. He has been given a large brain by mistake, since for him the spinal cord would suffice.

- Albert Einstein