Unattentive long distance boyfriend advice

Three months ago I started dating this guy that in early January moved to a neighboring country for work. I’m currently in my last semester of my Bachelor’s, which I’ll be spending in a country eight timezones away from where he currently is. Despite the obvious difficulties, I really want to try and make this work out, as I plan to move to the country he is in after my graduation and work there as well. I haven’t been particularly serious with relationships in the past, but I really want to commit to this person and I really believe we can make it.

Things started off pretty well but since he is a consultant, his hours at the workplace can get pretty crazy. Knowing this and the fact that he also has family and friends he spends time with, I’m trying to be super conscious and not nag him too much with video calls. We chat regularly, but I have recently noticed that he has become more absent - convos are usually us sending memes but not talking much, I am always the one that initiates calls and even when he is free during the weekend, he is not particularly keen on talking.

I really don’t want to doubt his feelings for me, but I have noticed that when I try to share “deeper” things with him (important achievements or my awful home situation/mental health) he seems to brush them off. This has gotten to the point that I’m not comfortable in speaking about much besides what I have done during my day or the daily news. Of course, I have other people I can vent to in my life and I am grateful for this, but sometimes I would want HIM to be there for me instead of my best friend or my mentor.

I think all of this is a result of him being so busy, but I don’t know how to communicate my needs to him without sounding super clingy or unreasonable. Any advice on this?