The sequel ramps this up, with Jackie getting a moment in an old diner with Jenny, reminiscing about how they first met (she saved him from being bullied), and even saying he doesn't care if what's happening isn't real, if it means a few more moments with her.
From the comics, for the 75th edition they did a What If? type story where Jackie has taken over the world. Old and grey but capable of doing whatever he wants, we see that one of Jackie's routines is to take a moment and go stand in front of Jenny's tomb.Extra heartwarming since this is was the only allusion to Jenny in a long time. A reminder that through out all the crap Jackie's been through and various hints of moving on with other women, Jenny is still in his heart.