whats the real deal?

i just found out that my girlfriend has had sex a couple of times with a guy that has about twice the gerth i do she said it was about as wide as her wrist and maybe about 8 and a half inches long im sitting at around 1 and 3/4 to maybe 2 inches thick and around 7 hard i know for a fact that girls like it thicker but shes lying to me i know it, i just need some input because i keep trying to talk to her about it and she never gives me a streight answer.. since i found out about this (wich shes been hiding our entire relationship) i think i lost my desire to have sex with her. she is a sweet girl but i dont know if i can look at her the same.. im starting to feel like theres no truth to what she says and everytime i bring it up she either crys or trys to turn it around on me.. am i wrong for wanting to end the relationship? i guess the reason im saying this is like right after she told me i began thinking about surgery because now im feeling like a pre pubescent infant next to this guy..but after a quick search of the internet it dosent look like something i want a doctor to ruin..because in the end its not really me anymore its whatever the doc did to it..

Unless she has been fooling around with him during your relationship with her, I would not worry so much. Comparing yourself to another especially in the bedroom, is not going to help the situation either. The fact that you've asked her multiple times and she can't give you a straight answer further proves that either it's not true or it really is a distant memory. If she's still with you and enjoys sex with you, then continue focusing on each other and YOUR relationship with her in and out the bedroom. Surgery and ending the relationship are your prerogatives, but I would not go so far because of your insecurity. Try to work it out with your girlfriend and own up to what was given to you.