My ex is texting me again. What does it mean in this circumstance?

I have not been with my ex for long time, over 2 years now. He has been texting me out of the blue on and off.
He does it after drinking a lot too. He most recently has continued to do so for a week or so now messaging me and I really am confused as to why.
I am being polite and conversational back as I am not rude or harbour any feelings now.
Just curios.. what does it mean that he keeps doing this?
My ex is texting me again. What does it mean in this circumstance?
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