Love is not a feeling. This idea of “being” in love is the modern era’s greatest lie. Love is a choice. It’s a choice to respect, honor, and be dutiful to someone even when it is not convenient - even if it sucks. Lust and desire are feelings you can “fall” out of. Love is a choice and giving up on someone is a choice, not because you “fell” out of something. Every couple I’ve talked to that had lifelong marriages always said the same thing - there are long stretches in any committed relationship where it’s stale, stagnant, and sometimes even downright unpleasant. But it’s the choice to stay and the choice to figure out how to rekindle the relationship that is the most important thing. Abuse and affairs are different - that’s always the retort. Those two things effectively relieve the other person in the relationship of any duty to even try. But short of those two things, if you’re committing to “loving” someone, you do it even when you don’t feel like doing it. If you’re not willing to do it, then you don’t “fall out” of love, you made a choice to no longer commit to the person.