turbofish

I need some advice concerning a decision which could change my future...

I've during a period of time suspected that my girlfriend is cheating on me. Several signs, the cell calls and she hangs upp, someone is calling often and hanging up etc. She's out with the "girls" often and when I ask whom, it's always someone from work I don't have clue of whom it is. I try to check for her cab when she comes home, but she always walks the last part, and I hear a car driving away. Maybe it's not a cab? A couple of days ago I scooped up her cell, just to check the time, and she went crazy, screaming I shouldn't fucking touch her cell and that I was snooping. Anyway, I haven't confronted her yet. Deep down I don't think I want to know the truth, but yesterday evening I decided to check up on her. I decided to hide behind my car to get a glance over the whole street and get a view of which car she emerged from. It was while I was while I was squatting behind my car that I realized the whole back wheel house had rust. Should I leave the car at a workshop or should I buy the spare parts and fix it myself?

Thanks for any input!