I would tell my dh about contact him if I did. I will tell him that I found him on fb too. I did think for a while there that is was possible that he had been killed or something because for the ten years we lived in the same area as we did when I was with the ex, we never seen him. In a way I am relieved to see him alive and kicking, just moved out bush. Kinda makes sense really. If it was dh who wanted to send a how you doing to an ex I don't think I would be bothered as long as it was in the open etc. I trust him and would read anything more into it.