Should I answer his messages the next night like he is been doing to me?

I've been talking to a guy and lately he's been answering at night and when I answer he answers the next day at night and I answer and again he answers the next night , and in both times I see he keeps online even though I answered and he also sees my IG stories anyway , if he sees my IG stories wouldn't be a reminder to answer me? Then I thought maybe he is interested but the conversation got boring for him , he feels lazy to keep writing it. Well it's not the first time he does this to me , sometimes he gives a lot of attention like answering every minute and all of the sudden he stops doing that and answers the way I told u , there were two times that he made me wait like three days and I told him I didn't like that and he's been trying not to do it I guess. He is not my boyfriend , we don't want that in a few years , but still I'm very into him , but I try no to romantize him or think he is the one bc I don't really think he feels the same way and I prefer someone more attentive to my messages ,
I have three questions..
1.. what do you think of this guy and our thing?
2.. what should I do? Should I answer his messages the next day or what
Should I answer his messages the next night like he is been doing to me?
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