I need some advice on what could be a life changing decision.

I've suspected for some time now that my girlfriend 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. Why? Is it not a taxi? I once picked
her mobile up just to see what time it was and she went beserk 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 g/f. 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?

Jacked from the Corral.net cause it's freeking funny!