<human>: My GF and I have been together for a year now and there has been something that has come up recently that seems to be bothering me much more than it should.

The other day we were driving back from a dinner date when a song that we both like came on her iPod. She then told me that for songs she has "plotlines" that go along with them. After pressing a bit further, she told me that these "plotlines" are elaborate romantic fantasies about other guys or what she calls "the idea of other guys". This hurt my feelings and she almost acted surprised when I said that it hurt me. Yes, I'm a bit jealous, and yes, I'm a bit insecure, so that is why it hit home for me relatively hard. She assured me that they are just fantasies and about the "idea" of people, not real people. The thing is, it bothers me a ton, especially when I find out that it's about her being wisked away from her boring life by a dreamy guy that goes to our school :(

As a little background, she keeps everything from her exes because she likes the memory of them. It has been a problem before, because she keeps around old pictures of her and her exes and it bothers me. I think some of her "ideas" of people in her romantic daydreams is one of her exes, but according to her it's not actually him, just her idealized version of him. 

I talked to her about this after she got back and after a long long talk and some tears on my part, she told me how I'm the one for her , how she is in love with me, etc. and I reciprocated. I thought it was better until I heard that song again and can't get the picture of her being held and loved by another guy out of my head.

Please tell me I'm insane or something, Reddit.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: GF of a year has elaborate romantic fantasies about other guys and it hurts me. What should I do to be less jealous/ accept the fact that she's with me etc?