Why am I obsessed with his ex?

I've been going out with my boyfriend for about 8 months now, he is my first serious boyfriend, and I love him very much, and I know he loves me.

I just seem to be obsessed with his ex girlfriends, one in particular, he went out with her for 3 years, even though they don't talk often anymore, they're still friends.

People always go on about how pretty she is, and it just makes me wonder why he'd leave such a "pretty"girl for plain old me.

It really annoys me to think about her, and them all the time. I just want to stop! I'm not usually a jealous person.

He doesn't know about this

Any advice?
Why am I obsessed with his ex?
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