You could be right regarding the contacting you because he is getting married. Who knows what his real motivation is. I just hate it when people aren't clear about their "agenda".
It is very obvious that you are way too good for him. You need to look forward and not back.
Tell him you wish he the best with his relationship and marriage to his new girl and reconnecting with your family is not the best idea for either of you or his current relationship.
From what I know of you so far through this site, you are very intelligent, have a lot of common sense, you are wickedly awesome and you've been through some tough times and quite frankly you deserve much more than what this guy has to offer - no matter how good he was in the sex department.
It's not uncommon to visit your past life prior to making a major committment in you next.
Just my thoughts...