I don't mind throwing in an ex machina or two to sort of 'force' them to include other people in this mess. Maybe some goofy sidekick character who has pried way too much for them to let go, or a self-isolated relative who is conveniently just remembered. Perhaps the little things like food and music could jog either one of their memories about a character like that. They're practically on the losing end as of now, and it'd be cool if something seemingly insignificant could give them some idea for a potential solution. If they're really gonna go into the cafe to get something to eat, a dish on the menu or a song on the jukebox could do it. The build up of attraction has to be taken slowly. It'll develop as the main characters themselves develop and experience some personal revelations along the way.