i was hoping it was something that got too fast too serious and they were both extremely wrapped up in it and each other for like... a month or so until the honeymoon period started to wear off, along with their rose-tinted glasses!! shocking no one but them, it turned out that you can't truly know everything about another person within such a short span of time and they started to realize they grate on each other's nerves like nothing else. i was thinking multiple breakups followed by reconciliations and more breakups until they decided that they were better off as friends. given all of the above there might still be tension and probably still a lot of butting heads, depending on when it ended for real? but i'm not set on any of that and we can change anything you want to change if you're interested!