Okay this is and unpopular opinion just an observation I’ve made from our married friends group we are all around the similar time span as you, anyways I see a similar problem with their relationships is them not having a goal. I’m not trying to sound harsh but me and my wife we have a kid our goal is to raise her our friends don’t have kids and slowly they hate each other more and more. I’m not saying have a kid but maybe set some kind of relationship goal that you guys can support and work together to accomplish. Just a guess from some one with the name sticky tissue on the internet just make sure you’re happy.