<human>: Can you give me the gist of the text in a nutshell?

I really trust my boyfriend, we have been together for 4 years. He tells me all the time how much he loves me and treats me incredibly well.
When a hot female comes on TV or walks by, I don't care when he tells me that he finds her attractive. He always lets me know when he thinks a woman is hot, and occasionally adds what he finds attractive about her (usually when I ask him). This does not bother me, it's comforting that he doesn't keep it from me.
However, sometimes I feel like he takes it too far. If there's a girl he has hooked up with and/or had feelings for in the past, it really bothers me hearing him go on about her legs or how cute she is or how gorgeous her smile is. It changes from "She's hot" to something that seems more personal to me (gorgeous, cute, beautiful, etc.). I already am quite jealous of some of these girls, and it hurts me having to hear him go on about their looks. 
I have told him this several times, and each time he tells me I'm being crazy for the following reasons:

He never talks to or hangs out with these girls,
He loves me not them,
He thinks I'm beautiful.

And all of those reasons are completely true. But it has nothing to do with me thinking he loves them or wants to be with them instead of me. It honestly makes me upset hearing it, I get a little pang of jealousy and sadness every time. I have told him all of this. He just makes me feel guilty for being 'serious' and 'grumpy' and 'hormonal.' But if he knows it upsets me, why can't he just stop? Am I being insane?
<bot>: Boyfriend of 4 years goes on about the looks of girls he's been with, am I being crazy for caring?