Why do I like someone I barely know?

Yes, I do talk to him everyday via text messages. Yes, I do talk to him on the phone at least once a week. Yes, we have been talking practically everyday since November. But lately I'm noticing that all our conversations are the same and they're dying (well, to me). We always talk about his bad sleeping habits, me eating, his "lying", our bets, Pokemon, his insomnia, et cetera. I mean of course there are a lot of topics we talk about, but that list of topics is always on repeat. Plus, it's always just us joking around, messing with each other, all that sort of stuff. It's never those mind-stimulating, thought-provoking kind of conversation or us getting to know each other. I'm comfortable talking to him, but at the same time I feel like it'd be so out of place for me to ask a simple question like... "How many girlfriends have you ever had?" NOT that I want to be his girlfriend or anything, I think my "like" is just a little more than a crush, and not past that. Anyways, back to my point, I'm just saying that even though we talk so much, I can't really have a meaningful conversation with him. I barely know him despite my hours of being on the phone with him and our attempted "all-nightys". I don't even know his favorite color. Or his favorite TV show. Random pointless facts, I know, but I'm just elaborating. And you know me, I love a person who can joke around and have a sense of humor, but I also love people who can keep me intellectually alert or make me think twice about my own opinions every once in awhile, a switch on perspective. I don't know if he's holding back like me or if he's just not capable of conversing about those type of things.

Now that I think about it, it's not like I'm helping out with it either. I mean after talking about such random, light topics for months, it seems so out-of-place or improper to ask a deeper question, you know? Seriously, I wouldn't mind at all just talking about whatever topic is thrown at me, but if I'm never asked to talk about that topic, I'll keep quiet. A history or something like that isn't really something you just randomly start explaining in casual conversation.

So back to my question... honestly I don't really know him, so why do I even like him?