Behaviour

My girlfriend of 3 months put up a picture of her "male" friend and her drunk from when they(there was 4 of them) were hanging out on the weekend. He has his head on hers...

Anyway, what should my reaction to this be?

I asked her who he was and she told me, I played it of like it didn't bother me. But i'm pissed right now.Also last week she said she was wondering if my parents would like her when she met them. So that's a positive sign.

I don't get why she would put a pic of this guy and her up? Is she trying to make me jealous?

Also she said she hasn't told her ex about us because he is unstable. But he is on her msn and she puts this pic up. The only conclusion i can come up with is that her ex knows her friends and he knows that she isn't dating that guy.

See I don't know any of her friends.