<human>: Can you succinctly summarize the text in 1-3 sentences?

I am a very insecure person. It's odd because I totally trust my girlfriend but after I learned her past it made me just feel insecure. She told me how she had sex with her exes best friend a few years ago, and then told me she made out with him at a party last year. This guy snap chats her and stuff sometimes and it just makes me so uncomfortable. I mean honestly I don't even want to ever go to a party with her friends because I am afraid he will be there and I just can't handle it. This guy clearly wants to hook up with her but backed off a bit when he found out about me.

Long story short, why am I so damn insecure? It seems every little thing she tells me about her past bothers me and makes me even more insecure. I want to be able to have her go to a party with her friends (without me) and be totally comfortable with it. Currently I would NOT be okay AT ALL with her going to one of their parties without me there. I feel my insecurity is the cause of most of this. Any tips on how I can I improve this?
<bot>: Insecure about girlfriends past hookups, don't want her around them because I am insecure. How do I make myself secure?