Any number of comical cliches! Two people who are pretending to be a couple because reasons; a pair of divorcees who rebound with each other while on vacation; the 'You've Got Mail' setup where they hate each other irl but share a flirtatious relationship online. I'm also not opposed to magical and light supernatural elements if that's something that interests you. Scenarios like Ghost, Practical Magic, and The Lake House are all on the table.