My ex drunk dialed me?

Im confused, after 2 months of breaking up, my ex texted me at midnight, one week after, he called me 4 times, the fourth call I responded, he told me that he misses me, that same night he texted me and I responded, the next morning, no response. 4 days later he texted me at midnight again asking me when will I return from my trip (I was traveling) I asked him: why? (Like why he wants to know), morning after no response...

He is immature, Can you telling me what is wrong with this guy? I miss him and Im still in love with him but this behavior gets me annoyed and confused.
My ex drunk dialed me?
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