I have seriously lost all respect for my girlfriend!

Anonymous
Im not the kind of guy who sleeps around with strangers although I've had the opportunity to do so. I'm not religious or anything, I just find it appauling that people can actually have sex with strangers like it was nothing. I believe firmly that sex is an intimate act shared by two people who know each other and care for one another. The 3 women I've slept with were all my girlfriends and although we're not together anymore, I don't resent them or hold ill will towards them, I'm still friends with two of them in fact. I have a new girlfriend now and I thought she was perfect. But I was looking at her Facebook pictures recently and I stumbled upon pictures of her in cancun partying with some friends of her. Then one of her friends told me that my girlfriend had a one night stand with one of these idiots and it just killed me. I'm so mad at her, I though she had more respect for herself, it just hurts that she's one of those slutty girls who I look down upon. I just want to break up with her, and I think she knows I'm pissed at her because she keeps asking what's wrong. How do I tell her she lost my respect without hurting her? Or should I just go have a one night stand so we can be on a level playing field?
I have seriously lost all respect for my girlfriend!
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