<human>: Can you provide a brief rundown of the text in within 3 sentences?

My boyfriend said he wants to call up his ex and ask what she's been up to, how she's doing, etc. Initially I said that I'd be fine with it as long as he lets me know when he talks to her and is open about what they talked about. But now I'm starting to have second thoughts and (though I don't know how relevant this is) I've been having a lot of dreams about him cheating on me, which I never had before.  

I've always been a little insecure about his ex. From the little I know about her, she shared a lot of his interests that I've never been able to get into (he's a hardcore gamer and so was she. I definitely am not) and all his friends loved her (though I'm still trying to get them to warm up to me). They were also together for a long time, and she was a lot of his "firsts". My bf keeps a lot of mementos of her too, like notes she left him and presents she gave him displayed in his room. This never bothered me before, but I think I'm just worried if they start talking, all the reasons he did date her that I can't fulfill will come back...

I go back and forth on whether I'm ok with him contacting her or not. I don't want to be the bitchy insecure girlfriend and forbid him from talking to people, but I also shouldn't be feeling like she's a threat. Maybe I just hope you guys can talk some sense into me :)
<bot>: My bf wants to contact his ex who I've always had insecurities about. I said yes, but now I'm feeling worried about it.