Girlfriend posts pics of her and other guy on FB....how do you feel?

Guys, if your girl posted a profile pic of herself with another guy on Facebook or Myspace and was wearing revealing clothing, how would you feel? Would you be cool with it or would that be unacceptable? Especially if you didn't know the dude and you are away? What are some of the inappropriate or unacceptable things a girl could do that would cross the line being in a relationship and would be a deal breaker?
Girlfriend posts pics of her and other guy on FB....how do you feel?
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