<human>: I'm dating this girl about 3 years now. 

I met her because a friend of mine was dating her sister. One day I went to their place to watch 'Winter X-Games', and when I first saw her I knew I wanted that girl.

So, I asked her out and she said yes. About 1 month later, we were officially a couple.

She always had a problem with 'attention'. Not just mine attention, other people as well. When guys makes compliments, she always returned the compliments. When guys flirt, she flirts back. But she never had guts to do the actual 'physical cheating'.

How do I know you ask? I know it's not nice, but she gave me her facebook password, and sometimes I check her conversations.

But now is the real problem. About 1 year ago, she had a conversation that got 'hot'. You know, just 1 step to see this guy, face to face.
I was so mad. We fought for days. But in the end, I just buried that and moved on.

Yesterday, I've found the same conversation, with a different guy. And now I'm just broken.
I've talked to her, and she says that she is really trying to change this 'attention whore problem', but I don't know if I'm ready to pass through this all over again.

I've asked for a time to think, because I don't want to bury this again, or just forgive. I want a solution. I want to be with her (I guess), but I don't want this to happen again in 3 months later.

She said that she's ready to change, because I'm the love of her life. But I simply don't know in what to believe anymore.

Do you guys have any advice for me? I'm really lost.

Can you condense the text into a few key points?
<bot>: Found some facebook conversations of my girlfriend talking with some guys about cheating on me, but she never do. Just for the attention, to know she is desired by others.