Why would you message someone you've ghosted years ago?

Anonymous
I used to date this guy (on and off for 3 years) and one day he just ghosted me. He basically just ignored all my texts and calls until i finally gave up after two weeks.

We've both moved on with our lives (he migrated to the US and I graduated from college).

Two years later, he found out I was on vacation in the US and started flooding my inbox with messages.

What would suddenly possess someone to reach out to someone they've ghosted in the past?
Updates:
+1 y
I replied and (politely) asked what he wanted. I was kind of hoping to get an apology or at least admission that what he did was wrong. All I got was a messaged me for no particular reason, just to "check in"
Why would you message someone you've ghosted years ago?
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