<human>: Can you give me a shortened version of the text?

Throwaway because I think my husband is on this sub.  
We've been together for 6 years now, married for 1.  
   
The other day we were talking and I brought up this girl I saw on my Facebook (it was her birthday) and I remember her adding me when we first started dating and him telling me he'd lost his virginity to her.  
Did I mention she looks like a porn star?! :(  
   
He said something about liking her and from memory he'd told me he'd never liked anyone before me.  
When I told him this he said he would never have said that because of course he's liked other people!  

I feel really sick about this and like a complete idiot for believing that I was the only person he'd ever had feelings for.
It's not that it bothers me that he liked other people before me, it's that for the 6 years I've known him I thought he didn't.
He knows absolutely everything about me and I feel like I don't know him anymore.  
   
It's really bothering me. I feel absolutely ridiculous but it's just making me wonder about everything. I felt so safe and secure and now I don't. I don't even know what happened with whoever he has dated. Am I just his second or third choice?  
I thought I was special and I'm too embarrassed to say any of this to him because I don't feel safe talking to him anymore.    

I feel like we've just started dating again, like things are uncertain.
I'm a very shy person, I felt like he was the only person I could be me around and I feel like this has undone everything. I feel completely alone.  
   
I feel broken. Am I insane?!  
I've talked to him a little about how I feel. He's being really sweet and gentle with me but I don't know what to do or how to make these bad feelings go away.  
Any advice would be greatly appreciated.
<bot>: Learnt yesterday that my husband has had other love interests after believing for 6 years that he hasn't. It's gotten me so upset and I don't know what to do.