If your girlfriend acknowledges that she wants to have sex with you some time in the future then keep it in your pants and be grateful that you've got a wonderful partner with whom you might want to spend the rest of your life.
It's fair enough that you want sex as a part of your relationship, and if she doesn't then you're never going to be able to compromise. If that's the case then you might want to re-think your future with her. If she really isn't interested in sex, and doesn't look she will be for a long time, then it's fair enough to think that it might not work out. It's a shame and all, but if you want sex and she doesn't, then neither of you can help having those feelings, but it'll never be resolved.
I know that if I was in your position I'd choose my partner over my neighbour in less than a heartbeat. Sex is one thing, but possibly a lifetime of happiness with your partner? I'd say that's worth putting up with just masturbation for a bit longer.
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