why i am still thinking about him after 10 years?

[amiga]

I am a single woman, I am happy independent successful person. 2 months ago I saw on the Facebook the profile of my ex boyfriend, it was my choice to leave him, but I don't know why since I saw his pictures with his family i had many contradictory feelings.by seeing his wife and his children I was convinced that we weren't suitable for each other and that it was a good choice to leave him but I don't know why I am still keen to follow his status and read every comment he writes, we are not a FB friends and even he didn't know that I read his posts, and don't want him in my life but I like to follow him why I don't know. I am so sad I didn't regret anything but also, I don't know how to describe what I do ? do I still in love with him or just to remember the past??