My fiancée and I have been together for almost 5 years. Around our second year out of nowhere, he turned me down for sex on my birthday because he just didn't feel like it. That streak lasted over a year where we would just have sex when he wanted. He improved for a few months and now we still just do it when he wants. We are busy people. No porn as far as I know. I'm pretty sure he masturbates when I'm not around. Because when he gets turned on he has to do it at that moment or it's over. I'm beyond frustrated. He says he loves me, we are getting married in 8 months. Help!