<human>: I met my girlfriend through my work, we don't work directly, back in the beginning of September and started dating the 1st of October. I have a bad past with girls, I've been intimate with quiet a few but never had a real relationship like this. I knew this girl was a keeper and special and decided I needed to change of few things in order for her and me to work (like how I view girls, be able to work through lows in a relationship, how a relationship works, etc) and she's made those changes for me very easy. This relationship I have with her is how a relationship should be and I love it.  

She's been with two guys before me, only had sex with one (this first guy ended up being a coke addict and the second cheated on her). She's girl who can be happy forever with one guy, she doesn't need multiple. She treats me amazingly and we make each other laugh and are inseparable. 

We don't really talk about our pasts, we do know about them though and she's accepted mine, even though it's a bad rep of a past. I just don't like thinking that she's had sex before me, now I know how she feels when she thinks of mine. The images I get of them two but, I know it was the past, I wasn't there, she didn't know me then. Is this normal to feel? To not like thinking of your SO and their past partners?

Also, is it normal to not have butterflies every time they're around? I know relationships shouldn't be based on feelings 100%, but how do I stop? There'll be times when I do get giddy when I see her and when I'm around her but, it's not every time. Is this normal? Am I just over thinking it?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Worried that I don't have the "butterflies" every time I'm with my girlfriend. Basing things too much on feelings. How do I stop?