Why would he text “I miss you” after ignoring my messages for 24 hours?

I have this guy whom I’ve been talking to for a while, we used to talk for a hours but lately, he started to ignore my messages for a few hours and the conversation started to get slow, last day he ignored my texts for a day and when he texted back he said good morning first, and I miss you before answering my previous messages.. I don’t know really if he’s interested or what. It makes me confused, because although he responds late but when he does, he seems interested. But now I don’t know if I should respond back

Why would he text “I miss you” after ignoring my messages for 24 hours?
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