Ok, back to role of the real OP. (If you are getting laid by your spouse who is off with someone else, then yes, you would qualify.)
Roles of OP: * To piss off spouse. Perhaps to get back at or to hope spouse will dump them upon learning the news, i.e. the coward's way out. * WAS has been looking all along and finally found a suitable person (for whatever reason) * Happens to be there when someone feels they get no emotional support from their spouse