A satisfying end could involve acceptance. The characters accept that the relationship is over and they move on in a positive way. Maybe they find new loves or new purposes in life. Or it could be that they transform their broken relationship into a deep friendship. This shows that they have matured and are able to handle the end of the romance in a healthy way. It's not always about getting back together. Sometimes, it's about finding peace and new beginnings after the heartbreak.
Self - discovery can lead to a good ending. Let's say the characters have been through a lot in the broken relationship. But then they each go on a journey of self - discovery. They become better versions of themselves. And at the end, they come back together because they are now more compatible. It shows growth and gives a sense of closure. Also, sometimes a bittersweet ending where they part ways but with a newfound respect and understanding for each other can be satisfying.