Been with my fiance for 4.5 years, we have a 2 year old together and after our son... I can't seem to get my drive back. I'm okay going weeks without anything but my fiance could have sex 2-3 times in a week. I feel like eventually he'll get frustrated with my lack of intimacy and want to end our relationship or he'll simply just cheat. It's frustrating to not want to be intimate and frustrating that I feel unattracted to him lately. I feel like every part of the relationship is awesome but the sex. I'm not sure how to fix it.. any advice?