After Robby gets into a horrible accident on his motorcycle, he is somehow transported back to PTMC
When he wakes up from his medically induced coma, they realize he’s suffering from temporary partial memory loss
He knows he’s a doctor, he lives in Pittsburgh, yada yada. It’s just personal relationships that seem to be all scrambled in his head. He knows Jack, Dana seems familiar, everyone else is really fuzzy, but Dennis seems to be unusually prominent in his memories
People write it off as Dennis being the last person to talk to Robby before he rode off
Dennis, with his sacrificial savior complex and enormous crush on his boss, volunteers to take care of Robby. I mean, he already has the keys to the place, and Robby seems most comfortable with that idea
Dennis is changing his bandages, scolding the older man when he moves around too much, coaxing him to relax, and entertaining him when he gets bored
He's cooking nutritional meals, making sure Robby takes his medicine on time, going out on nature walks with him so he's not just cooped up inside
It suddenly clicks in Robby’s mind. This is his husband!
When Dennis is feeding Robby a bite of this new dessert he’s trying out, Robby thanks him by leaning over and pecking his lips, y’know, like a husband would do
Dennis lights up in a furious blush, making Robby confused as he stutters out an excuse and flees from the house
Robby noticed before that Dennis doesn’t have anything personal around his house; it’s all Robby’s
Robby is horrified to think that they’re in the middle of a separation, and the only reason why Dennis stuck around was guilt and some sort of misplaced obligation
Now Robby is on a mission to win back his husband and stop the divorce from happening
He calls up Jack and tells him his plans, confused on why Jack is howling with laughter, while Trinity is laughing at Dennis back at her apartment, while he’s face down on the couch and screaming