I cheated on my girlfriend now she's damaged my car why does she find the need

[Mike]

to do that? My girlfriend walked in on me while i was having sex with another girl and i've tried explaining to her that i was sorry for what i had done. We have been together for over a 1 year and a half and i really wanted to show her how sorry i was. Now i go out thing morning to find out that overnight she came and sprayed paint with the words cheater and other profanities all over my car! Why did she find it necessary to do this, i apologised and i sent her a apologetic letter saying i was sorry and now she does this to me. It's gonna cost a fortune to take care of the damages all thanks to her. I can't believe she would ever act like this. I know it was her, because her friend rang me from my girlfriends phone and said "do you like your cars new body work, Mikayla finally found a way to get back at your cheating a**! happy cleaning" Why do this to me, i was already at a low because i felt awful for cheating on her and now this!! I actually believe that she was influenced by her friends to do this to me, because she isn't the type of girl to do this type of act.