My GF of 2 years broke up with me for 2 weeks because I wouldn't let her baby sister come stay with us at my house for the holidays, not that it's an unreasonable thing to ask but I don't think its an unreasonable thing to refuse either, I hardly ever say no to her but this time I just wasn't for it. In the 2 weeks we were broken up I slept with other women, call it rebound sex. 3 weeks ago she asked me to get back together & we did. I Honestly thought all would be well again but now I find her repulsive though she's beautiful, and it gets worse everyday. I no longer feel the relationship is worth it for me.
How do I end it respectfully?