Is it normal to really like someone but lack interest in them?

Does it still count if the person just really loves the way you do things, just the way you are, but doesn't really show interest in your own interests? For example, you know when the person is talking to their partner about random stuff and their partner just can't help but smile at you because he/she is paying more attention to how you are than what you are actually saying? Is that bad or is that still good? I've seen it a few times and I think its cute and understandable. But it does sound bad when I actually explain it to someone how the person doesn't pay attention to what their partner is talking about. Sometimes they did catch what you said but in their own way. For example, you could be saying "hey babe I want to coach my own sports team one day maybe like golf and..." and the other person is just like "uhuh, uhuh..." but smiling at them because they're paying more attention to how they talk, move, etc.
I remember when me and my partner just started getting to know each other and went to eat, it is probably one of my favorite days with him. He was driving and I was speaking and he just kept turning to me and smiling and eventually he leaned in and kissed me. Yeah he interrupted me but I couldn't help but smile with happiness after he kissed me. I think it was so sweet and he couldn't hold himself back from kissing me. To this day, he does keep doing the same thing and I recently asked him what he does know about me, and he named a lot of things I didn't expect him to know. So I guess he is paying attention at the end but in his own way. There are things though he brushes off but he still enjoys my personality.
So is it normal to be into someone although you lack paying attention to some of their interests? BTW, love is totally subjective. People express it and feel it in different ways but one way that I believe everyone shares is the feeling consumes you and makes you happy.