I am not an experienced Divorce Buster, but I wanted to offer an alternate opinion.
You really have nothing to lose by texting back after a decent interval of time (though realize it may very well NOT go the way you hope).
So long as your text is brief, informal, upbeat, and not pushing for a meeting or continued contact, what could it hurt? There is no relationship at this point, so there is nothing to jeopardize except your heart and your pride (and you seem somewhat willing to take that risk).
The only thing you risk is another rejection if he does not reply back.
Just my two cents.
Me: 35 Him: 43 Together: 19 1/2 years 1st Bomb (IDLYAM): March 2011 2nd Bomb (OW): April 2011 He abandons home/bills/everything: May 2011 He's bought a new house for OW: September 2011