Should I contact my ex after 10 years not speaking?

I am currently writting a diary summering up all my love stories. 
Writting the diary made me think about my 1st boyfriend I was seeing when I was 15 yo, he was 30 yo at that time. He was my middle school teacher a year before we started seeing each other. We were seeing each  other for a few months until I moved to NYc from France. We kept talking everyday for 2 years and finally ended it a year before I moved back to France. 
I am honestly just curious about why he was seeing me at the time, im now 29 happily just married and just was to have a coffee to catch up on our lives.  I wonder if I should do it or not, i found his number on the yellow pages.

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