Why would my ex message me 7 years later?

My ex messaged me on Facebook last night and said he's happy I'm happy and that he's happy he's found the love of his life. He said he knows it's a random message but he just wanted to let me know and that he's grown up a lot in 7 years.

Im engaged and just had a baby last month. Why the heck would he message me after so long? Weird
Why would my ex message me 7 years later?
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