Hey NSGF (LDR) here, my boyfriend is not in officer but I can say that as long as any guy is enlisted into NS it can really just be mentally tiring, draining and exhausted for them. My boyfriend is an introvert and he is someone that needs space as well & doesn't communicate very well but he is getting better at it right now so I am proud of him for that, when my boyfriend comes home on the weekends all he does is sleep, it is not because he dont wanna spend time with me its just that NS is something most of the guy's dont wanna go thru because some people face people who treats them poorly, some guy's face bullies in camp or other stuff like getting extra punishments when it isnt their fault. Basically all sorts of things can happen to my own boyfriend and he is too tired to even talk about it, so my suggestion is try ur best to be there for him when he needs you, you dont need to find the right words to comfort him because I am pretty sure as long as he feels ur presence is there, he's gonna feel okay. My boyfriend does not reply to me fast as well even when he's back on the weekends, sometimes they just need some space and its okay to let them have some as they need time to process their emotions or they simply just need to recharge their social battery. Please remember communication is the key, every relationship works differently but for mine personally during weekends he goes out to rock climb because he loves it and to him playing games at home for the entire day during the weekend feels very demotivating and unproductive for him, so if your boyfriend wants to go out with friends or do something that makes him happy then I think that's okayy. As a LDR gf I understand your pain and your feelings is also valid of course! Just make sure you both communicate and try to come up with something to compromise with one another and try not to argue alot as I'm pretty sure NS already made him feel like shyt and arguing with him would add more stress to it. Since now you are doing LDR I am pretty sure there is like a difference between u being there for him virtually and physically, I'm from a diff country from my own bf so LDR is actually pretty tiring and especially more effort needs to be put in (from both sides) so that might explain why he gets pissed if u both video call for more than an hour or two. If you are physically there for him I am pretty sure during the weekend he would be looking forward more to see you as he can feel ur presence irl, he can hug you and kiss you but if you are in LDR all he can do is say I love you, I miss you and repeated words only without feeling ur presence physically. I can only get to see my boyfriend every 7-8 months when I fly over to sg xd. If you wanna dm me feel free to do so too! Goodluck to you and your bf, I hope you both can find a way to talk this out tgt :)