Not a easy way to respond and stay out of the R between father and son.

Maybe respond that things will get better with time and understanding, that they both are dealing with life issues...

Or just ignore his text.

Me 43 ring off Oct 2014 (my ring back on Feb 2015)
H 51 (ring off 7/2013)
M 2007 T 1996
S 14
July 2013- H told me he was unhappy.....said he is staying for Son
Feb 18 2014 Found out about OW