<human>: So my BF (27) and I (24) are in a long distance relationship (we started dating in person and have been together about 9 months).  Today he casually started a story with "my ex-fiancee came into the bar last night...".  I hadn't previously known that he had been engaged. I'm not upset about him not telling me until now or anything like that, I just don't know how to handle this new information - I can't get it off my mind and I feel sick to my stomach.

First, he's told me many times that he doesn't ever want to get married.  I suppose I'm okay with this, but it's certainly something we've talked about a number of times.  It comes as a huge shock to learn that he had proposed to a girl and planned to get married before (he said about 6-7 years ago). 

Secondly, my insecurities are really messing with me.  I've always had problems knowing about my BFs pasts, especially those that have involved serious relationships.  I'm worried that he, at some point, was willing to spend forever with another girl...and can't help but wonder if I'll always be second to her.  What if he never feels that way about me?  Now I feel like I have to compete with this girl from his past.  

Also maybe relevant, my last serious BF (who I lived with) had an ex-fiancee and never really got over her.  In fact, him cheating on me with her is what ended our relationship.  I think this feeds my insecurities even more - knowing that he always preferred her to me.  

Other than this, our relationship is amazing!  I love this man so much and I don't want to let him know that this bothers me (I did tell him that I was really shocked), because it's all just my own insecurities and desire to be ....the love of his life?

Can you give me the gist of the text in a nutshell?
<bot>: Boyfriend told me he has an ex-fiancee.  My insecurities are really bothering me and I'm not sure how to deal with this information.  How do I get past this?