Why would a guy unsend a message?

This guy messaged me and unsend it (the next day) before I got to reply. I know for sure the message was intended for me. This isn't the first time he did this. We were dating for a bit. Didn't work out. He dated somone else. Out of the blue after 7 months, he messaged me again. Don't think it's a booty call cause he messaged me in the afternoon. It was just "hi there".

What he's tryna do here?

Why would a guy unsend a message?
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