Am I falling out of love?

I've been with my boyfriend for 3 and a half years and it's been great, of course not perfect but we got through all the tough times and came out stronger.

However recently I find myself feeling very annoyed at certain things he says or does. For context, I have a higher education and he doesn't. I've never been one to be a snob about it as I don't think having a higher level of education means you're more intelligent but idk I get pissed off at some comments he makes that make me think he's quite ignorant (eg he said covid didn't exist to him because he didn't have it).

Also which is the main issue I think, our working hours don't match too well so we don't spend much time together and I suffer it quite a lot but he doesn't seem to mind which annoys me. I also been feeling that he doesn't have any interest in what I do or my day as he never asks and seems so uninterested when I talk.

When we spend time together though is still great and I truly feel like I do still love him very much. But when we're not together and I feel very lonely I start doubting it and I even fantasise (not senxual, in a romantic way) about other men (fictional characters not real men) which I only used to do before I met him

Any advice? Am I just feeling unloved?