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Theland, he messaged me on FB long after I posted here. I was quiet touched by what he wrote to me actually. As I said earlier in this post, I had no contact with him after my split from his mother but he said that some of the things that I taught him had helped to shape where he was today. I slept a bit easier last night after hearing that.
We never know what impact our own lives have on others sometimes, good or bad. I just presumed that he forgot all about me.