If it makes you feel better to keep a record, T, the easiest way I've found (and also the most reliable in the event it WOULD ever matter):

Take screenshots of the communications and download them to your computer. That way, they're even date/time stamped.

M: 40 H: 44
Married 14 years
S11 & D6; D20 & D19 from previous M
2BDs/PAs, 8 years apart
Piecing: April 2014