I settled for, "Ahaha! [Cat's nickname]-bee! Yeah, my weekend was very busy, but fun!"

No response, who knows if he'll bother. LOL

Purposefully didn't ask him about his weekend in return, too.

ME: 38
BF: 40
T: 10y, no kids, no M (by choice)
BD: 7/14/14, BF admits to PA, wants out, lies about new R.
10/1/14: I move out, BF lies about move in with OW
12/4/14: OW confronted, reveals all the lies