My girlfriend sent a nude pic to a guy friend she is attracted to and now?

when I found out she took him off Facebook and deleted him from her contacts. We almost broke up and I told her is she had anything to do with him I was done. Now, she's added him back to FB and he texts her ever now and then. Do I tell her I'm done and walk away or do I just keep loving her and hearing her say she loves me back and ignore it? Do I have a right to bring it up and be upset over it? He likes all her pics on Facebook and she likes some of his back too... I don't get it!
My girlfriend sent a nude pic to a guy friend she is attracted to and now?
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