Why is he constantly messaging me?

I’m speaking with this guy who lives in the US. He added me as a Facebook friend and we have a few mutual friends, because he is related to some friends I met on holiday years ago. We live in different countries but he messages me every day, and replies to my stories and love heart reacts to my photos too. We have been chatting for up to a year now on Facebook and he writes very long messages, but it’s confusing, does he just want a pen pal? Why is he always messaging me even though we live in different countries?
Why is he constantly messaging me?
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