that would be perfect! he has a tendency to really lay it on thick and give the impression that he's a super romantic, really good guy initially - maybe they were a tinder match/repeated hookup that seemed like it was really obviously heading into relationship territory only for him to shut her down pretty hard (being flippant and dismissive for a little while before outright saying it was never going to be a thing) once it became apparent she was developing genuine feelings for him? if you really want to make things messy we could maybe even say they hooked up again afterward at whichever point!