Don't make it too rushed. Take the time to develop the resolution and show the characters' growth and acceptance. Also, avoid a forced happy ending if it doesn't fit the story's tone.
You could have the characters part ways amicably, realizing they have different paths in life. Maybe they express mutual respect and gratitude for the time spent together.
Well, you might end a love story by introducing an unresolvable conflict, like a long-distance move or a fundamental difference in life goals. This forces the characters to recognize that their love can't overcome these obstacles.
Maybe let it end with a bittersweet moment that shows growth and acceptance. For example, one of them moving away for a better opportunity, but they promise to remember the good times.
You could end it with a poignant moment where they both understand that the love has run its course. Maybe a heartfelt conversation where they express their gratitude for the time together and accept the need to move on. Or, have one of them make a selfless decision for the other's happiness, even if it means ending the relationship.
One way could be to have a mutual understanding and a peaceful parting. Maybe the characters realize they have different life goals and part on good terms.