My girlfriend asked her friend for sex

ok...so a lil while ago my girlfriend asked her guy friend I think also her best friend if he would have sex with her but says she meant it playfully not meaning anything about it though she knows I feel uncomfortable with her friendship with that guy because he is interested in her as more than that he's flirted with her and I told her that he couldn't call her any flirty names,and that if he would stop asking for her number and she says that she loves me but the thing is,In my eyes she was this cute little innocent girl and then for her to say something like this to her guy friend like just totally broke my heart so what I'm asking you guys is what should I do to get over this,because when she told me about this it just brought up memories of getting cheated on before and I don't know what to do I'm lost.
She told me on the phone that she loved me but I just didn't have the heart to say it back because of this,and as much as I hated acting cold towards her but I just couldn't talk to her.
So what should I do should I forgive her?Do you think it's bad that she asked her guy friend if he would have sex with her over the internet?Please help I need guidance.
She also said that it was like she wanted to prove to him that she wasn't a kid so I don't get it why should would want to be something she's not?I love her how she is I love that she is like a little kid and I told her that yet she wants to prove to her guy friend that she isn't and trying to impress him.

Here, let me give you a little insight into girl world..

It holds no relevance that he has the hots for her, if she feels no spark for him. Trust me buddy, she put him in The Friend Zone a looonnnggg time ago. If she didn't, then she would be with him, not you.
Chances are that your insecure in your relationship with your girlfriend, not her relationship with her friend. She is reveling in all this attention right now, and the more you try to take him out of her life, the more she will rebel and cling onto him.

Tell her that you understand she was just joking, and your sorry for flipping out. However, you'd like it if she wouldn't make sexual suggestions to another male, because after all, you are her boyfriend, and have the absolute right to ask this from her if it is not already a given.

Prove to her that your not possessive, let her hang out with him and even make an attempt to reach out to this male character. If you notice that there really is something going on between the two of them, dead the relationship. Thats harsh advice but the brutal truth.

Also, about the whole 'little kid' thing. Have you considered the possibility that she is just growing up? Your at a sensitive age there fella, she might be developing her new personality as she experienced physical and mental growth. Maybe she is in the process of actually NOT being a little kid anymore. The question is, are you ready for this? Are you going to grow up as well? It is important for you to encourage these changes, not blow her spot up. Because once again, she will rebel.

Hope this helps! :]

yeah what she said I guess lol! looks to me like you should keep an close eye about whats going on but dont be to obbsessive!last thing a girl wants is a stalker boyfriend or an boyfriend that doesnt trust her. but tell her you dont like the guy but your not going to make her stop being friends with him!

It appears to me that she is not stable and committed to the relationship with you - Red Flag definitely that she is supposedly your girlfriend yet asks another for sex - I wouldn't stay around.

In your place I would ask the girl if she is attracted to that boy or not. I would add that I understand any answer without any negative emotion. If she answers 'yes', then I would accept that the girl is attracted to two boys in the same time, that may happen to everybody , and that is not a sin or else. So I would propose a 3some tryst and I would try to satisfy the girl's attractions together with that boy. I am sure, after a while she would be satisfied by me without the other boy, because her interest was fulfilled.
One thing is sure: I would not suffer of jealousy for a minute, because that is nothing else then self-torturing. The life is more interesting if unaccepted or strange things happen in it, then when everything is so 'normal' or regular.

yeah I dont think you deserve to be hurt like that.
you deserve way much better than that.
find some that loves you and wouldnt hurt you like that.