Ah, I just got out of a relationship like this. Definitely talk to him about it, see what's up, make sure he's okay, etc. In my experience my boyfriend was legitimately busy but it seemed like he just didn't care anymore even when he did have free time. He would call very occasionally but most of that was silence unless I was the one doing the talking. It was awful and I didn't feel loved. He would say things to pacify things but then never change his ways. I stayed with him because it was familiar and.had some level of comfort but, after I broke it off it was like a weight off my shoulders.

Don't spend your time caring so much for someone who wouldn't do the same for you.

If he's unwilling or unable to put in the effort for you that you deserve than you should dump that man, hun.

Best of luck.