Honest opinions

I wanted to know what you guys think are the stages you’re falling out of love with someone, Like what characteristics are there, or is it just you’ve been together for quite some time and you’ve reached that point where, you know I dunno how to put it into words hahaha but you get what I mean? Like relationships aren’t always rainbows and butterflies 24/7 forever. So how do you know if it’s a funk or you’re starting to fall out of love ?