<human>: I've never actually asked for advice like this, so please excuse me if I screw this up.

I'll just start from square one. Ive started dating this wonderful, amazing, funny, beautiful girl. Lets call her Jess. I'm amazingly comfortable with her, something I've never fully been able to do with many girls. Having a great time together, but some things have started to worry me.  

For one, she's kept every love letter and email  ex boyfriends have sent her. She's on occasion read them to me, and I've tried to be cool and play it off, but I'm kind of uncomfortable with it. Secondly, she is in constant contact with her most recent Ex. She makes it a point to always make it clear that they're friends and nothing serious is there, but recently he's been saying that the chances of me making her happy are slim and that he loves her. Apparently some of what he says gets to her, and she says she has doubts and isn't sure. And lastly, She's definitely bi curious, but has said that if given the chance, she would definitely sleep with a girl if she could get away with it. And that's what is really bothering me. Jess and I have been together for a while, and I feel pretty committed to her, but her saying that kind of felt like she was admitting that she would cheat of me if the chance arose. Am I freaking out about this unnecessarily? Am I looking to much into this? I want this to work, but my doubts have really started to bother me. I'm confused and afraid and don't know what to do. Any advice would help.

Give me the gist of the text in a nutshell
<bot>: girlfriend keeps all old love letters, constantly talks to ex that wants to break us up, and has said she would sleep with a girl if given the chance.