<human>: We've been dating for a few years now and I am still in love with her as I ever was. I think she is beautiful but I don't find her sexy any more. I don't find myself getting excited to explore her body or get particularly aroused by her touch or sight of her naked body. Her appearance hasn't changed much since we started dating. She hasn't put on noticeable weight or anything like that and she really does have a nice body and a pretty face but it has lost it's excitement for me. I can still get off to porn pretty easily so I don't think it has to do with my hormones. I have only had sex with her (though I have dated several girls before her) and I find my mind wandering sometimes and wondering what it would be like to be with another woman. 

I am not unhappy at all when I am with her. She's still my best friend but I can't deny that I simply find it less appealing to have sex with her. It seems boring and everything expected. I wish I still had the same excitement that I used to because I still love her very much but I don't know how. I can't tell her this without her feeling completely self conscious and it wouldn't do anything but make her feel bad because she wouldn't know how to help and it's not something I want her to feel responsible for or pressured by. Any advice would be very welcome.

Can you give me the gist of the text in a nutshell?
<bot>: I've been dating my girlfriend for a few years and while she is beautiful and hasn't changed much in appearance, I don't find her sexually appealing any more or find sex as arousing.