Help !

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I need some advice on what could be a life changing decision. I've suspected for some time now that my wife has been having an affair. The usual signs. Phone rings, I answer, someone hangs up. She started going out 'with the girls' a lot recently although when I ask which girls it is always "Just some friends from work, you don't know them". I always look out for her taxi coming home but she always walks down the drive although I can hear a car setting off. As if she has got out of the car round the corner? Is it not a taxi? I once picked her mobile up just to see what time it was and she went berserk and screamed that I should never touch her phone again and why was I checking up on her. Anyway, I have never approached the subject with my wife. I think deep down I just didn't want to know the truth but last night she went out again and I decided to check on her. I decided I was going to hide behind my car which would give me a view of the whole street so I could see which car she gets out of. It was whilst crouched behind my car that I noticed rust around my rear wheel arch. Should I take it into a body repair shop or should I buy some stuff from the local auto shop and try to repair it myself?