He could live without sex? I bet you the minute you aren't there and he isn't getting any that he could see in the forseeable future, his sex drive would go up. I don't buy this at all. I see excuses on his part. It's gotta be frustrating being the one to initiate it all the time?
The only experience I have to base it on is from when I was depressed, I didn't care that much and she initiated it all. I also didn't have that passion as well, which is what you mean by emotionless right? After she got fed up with my bs, she dumped my ass. You better believe after not getting it for a while, I could boom boom non stop for what feels like weeks. I was spoiled, selfish, used to having her do it whenever she felt like it and just went along for the ride. It's hard to say it's depression though because everything else seems in line. Everything else is in line right?
If he has problems or issues, he is going to have to want to do something about it. In this current world he is stuck in, one of engagement where you are seemingly not going anywhere for a while, it's probably pretty comfortable to fall into a rut and stay there. Very possible. I'm not saying that you have call off the engagement and make a big scene, but too many times have we seen us men having to lose that comfort and getting our world shaken up to get our asses moving. Usually by then, it's too late.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.