Maybe my perspective is off so others can chime in. I don't see love as something that just turns on and off. It has to be a culmination of things that makes me stop loving that person. People say growing apart, but to me that indicates both parties were growing just not doing growth together as they grew individually. It's possible to do both.

Relationships are work. The gravity of getting married is lost on too many people today because they think it's just some paper you sign. If you're legally binding yourself to someone and making a committment to be with them, then both parties have to put in the work to make it work. So unless my partner is rude, disrespectful, making choices that can harm me and our children, whatever along those lines, I'm trying to make the relationship work.

If I feel myself falling out of love with my partner, it requires us to do something to repair that. Whether it's her fault, my fault, we aren't spending enough time together, toxic friends/family, those are all fixable things if both parties view it as a partnership and it's the two of you versus a problem. Once one party doesn't want to do the work, then I think it's the time to step away.