Advice? No rude comments.

I've been with this guy for over a year. We recently ot engaged. We are not trying to concieve, but we aren't preventing it. I don't see him much anyways so I rarely see him on my fertile days. 
He's got a lot going on. His parents are getting divorced, or are thinking about it anyways. His boss is making him work on days we usually hang out. He's leaving for South Carolina in 6 months, and will be gone for 5 months for the Military. I know 6 months is a long timw away, but still stressful!
Plus he has school, so his days are pretty long and tiring.
Anyways, he's an emotional guy, just doesn't show it. When things get tough, he ONLY thinks negative. It's like his brain is wired to put him down.
Also, in the winter he gets irritated more. Because it's cold, wet, groggy, and when it rains he's overall in a bad mood.
Well today I noticed he was being different. The past week or two he's been really upset an depressed. Not so much distant from me, but not as cute and sweet. 
He told me today "I feel like somethings missing. I don't want to try for anything anymore." Then he called me, and we talked for over an hour.
He said "I'm not feeling it anymore. I don't get butterflies anymore. I've been in denial 100%. I don't have the motivation to try and be cute with you. Actually I don't care about anything right now and I don't know if it's because i've been so depressed lately." 
 I noticed i've been putting pressure on him about ttc. So I told him I was sorry for stressing him out and that I understand where he's coming from. I also told him that i'd like to try to make it work because he is stressed over everything and the way he is, he thinks negatively when he's stressed. 
After we switched the topic, we just talked about other stuff. His school, the military, stuff like that. And at one poin in the middle of his sentence about the military he said "We're getting married." i let it go.
Then we were talking about why he doesn't want to go to war, then death. And he said "I hope I die having sex with you" (as a joke) and then we continue to talk about old people. And he said "babe when we're like 80 with 10 kids, we'll still be having sex like animals" 
After more talking, he had to go to work and at the end he said "I love you sweetie" And I replied "I love you patrick" and he chuckled then said "i love you more baby" and hung up. 
I hate to put my whole relationship out there. But i need some input. Does it sound like he wants to be with me? Or should I be afraid of him leaving? 
He says he just needs to see me more. Could that be why?
We're going to talk about when we see eachother either tomorrow or monday. But i'd like some input..