<human>: Can you condense the text into three sentences or less?

After my BF left for a job abroad we became an LDR (3 months in, around 2 years left) and things have been a bit rocky. 

The problems were mostly about communication (I felt that it wasn't enough in both quantity and quality whereas he felt that he was doing more than enough considering his busy schedule), and once, my bf told me he wished we had met when we were older because he thought we wouldn't have these smaller problems if we were both more mature. 

And that got me honestly wondering, how is a relationship (expectations for each other etc) different in your late 20's/early 30's after you're out of school and working? 

For example, I feel like he doesn't care if he doesn't text me in the morning, or I'm really sad when he comes to a business trip back home and can't see me the day he arrives because he has too much work / is too stressed out and worried about work to do anything but work. 

That being said, I don't nag at him if he doesn't text me in the morning, nor do I force him to make time in his schedule to see me. I understand he has a different schedule from me, and is working in a high pressure environment so he can't be as showering me with attention/affection as he used to, but it does gnaws at me a bit because if I'm honest with myself it does feel like it's a big deal, like he doesn't care enough anymore. 

And I'm wondering if later on, when I become older, will I look back and laugh that I was such a kid or is stuff like this legitimate issues in a relationship? 

(if you can't already tell, it's my first serious relationship, any advice would be honestly appreciated)
<bot>: Boyfriend works and I'm still a student. His being busy makes me feel like he doesn't care but am I just being needy? Would I not have cared if I'm older?