I need an explanation right now?

We had an argument with my bestfriend. And we stopped talking like for a month and we basicly never connected since. Yesterday at 1am he texted me and told me
"I'm missing you." And I replied "Me too."
And he saw my message at 5am but didn't reply for almost a day now. I wonder why would someone says I miss you and don't reply after he gets a "me too" answer?
I don't understand guys, why do you think he texted me and didn't reply after that?
I need an explanation right now?
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