<human>: Can you provide a brief rundown of the text in within 3 sentences?

I've been going out with my girlfriend for two years now and I've never cared about anyone as much as I do her. She's been my first everything, and namely, she was the first girl to ever notice me and actually genuinely like me.

I jumped into this with absolutely no experience whatsoever and I guess I just didn't pay attention to the fact I wasn't attracted to her. She's not ugly by any means, she's cute, just I feel absolutely no attraction to her whatsoever. I love spending time with her and doing things with her, but when it comes to sex I just don't like it whatsoever. I always feel like it's a chore and I've convinced her that I have a low sex drive so we only do it a few times a week. In reality, this is quite the opposite, and the only times I'm ever able to have sex with her is if the lights are off and I'm imagining other people. Otherwise, I just simply can't do it. It's super fucked up and it always makes me feel awful but I just want to make her happy and I don't want her to know I feel this way because she already has low self esteem and it'd crush her.

I honestly just have no idea what to do. I've been thinking of breaking up with her for months now because I just have these urges all the time when I see girls that I'm attracted to. But then the other half of me tells me I'm being terrible and that this just shouldn't matter that much since we've been through so much together. 

I guess mainly I really need advice on is if this is viable. Have there been other people who have stayed in a relationship when they're not attracted to their partner?

I would greatly appreciate some advice, I don't really have anyone else to talk about this with.
<bot>: I've been going out with my girlfriend for a long time, but I'm not at all attracted to her and I don't know what to do going forward.