Have you ever been in a relationship with someone you love, but things are not the way you want (and don’t seem to be changing)

Ladies!!! I’m so so so in love with my man, and we do laugh a lot and have a great time together but it just seems like we’re in the mud and can’t get out. Sex life is not as intimate and “lovey” per day as it used to be. “I love you” became a routine thing we say without having any emotion attached to it. Our arguments seem to get worse and worse. It’s like some times things are really good and some times things are really bad and there’s never an in between and it sucks. The thing is, I don’t wanna divorce over this and he doesn’t either. That’s not an option unless there was/is cheating or abuse. Please someone help 😭 what can I do to make the happy vibes start flowing, where we mutually want to be around each other and enjoy ourselves.