Hmm, I don't share the view that you're a selfish bitch.
Sex drives come in a large variety. Yours is seemingly a lot higher than that of your fiance.
This can be a reason for an open relationship. But many seem to be unable to tell the physical and emotional part apart.
In my opinion it's a bad idea to stay with someone if you don't connect on a sexual level. A solution can indeed be an open relationship but this will thus only work if the other is able to see it as just physical pleasure and can trust in you keeping it that way.
So, either break up with him, for both your sakes, or explain to him in full detail what an open relationship means to you and what ground rules you'd set for it.
If you continue as is and he forgives you, prepare for a sex life far below what you want.
