I'm nearly certain it's one of a couple things.

1) Maybe you've just left the 'honeymoon phase' of the relationship where things aren't as exciting as they used to be and maybe the communication has gone done a little bit. It's completely normal in a maturing relationship and there might not be any reason for concern. Sit down with your SO and be completely honest, let them know that you think the relationship is kind of falling apart. See what they say, say what you're thinking, talk it over.

2) There is a book called 'five love languages', it teaches that people show that they love each other through different ways. Maybe you show love by doing things for your SO and you feel loved when you receive verbal compliments and affirmations. However, your SO might show love by physical touch (hugs, sex, etc.) and might feel loved when things are done for them. In that scenario, your SO feels loved but you don't because they are not speaking your love language. You're expecting verbal messages of love( i love you, you look great today!, etc.) and when all you're getting is hugs and cuddles and maybe those just don't make you feel loved as much. Once again, sit down and talk about this, explore what may be causing these feelings. Your relationship doesn't need to drift apart, a simple conversation could solve everything and become a gateway to happiness.

Good luck to you, also that book is a pretty good read and a bit eye opening (even though the information seems obvious, it's still nice to have it displayed because often we take obvious stuff for granted and forget about it.)