All things considered, this seems an odd place for relationship advice....but since you asked and I'm in a mood this morning....

I've found over the years that people in civilian relationships tend stay together for a lot of reasons, and while I almost hate to sound cold-blooded about it, those reasons are usually more logistics and habit than anything else....I generally think that love falls pretty far down the line in terms of hanging on to something that isn't working.  Then again, maybe that attitude is why I have an ex....

Didn't you post a question like this before? But it was about you.

Just recently I heard someone talk about the 80/20 rule.  They thought that if someone has around 80% of what you look for in a SO, that we should be reasonable enough to just let the other 20% go, because we are not perfect either.  But most people see someone else that has only that other 20%, and we will leave the first relationship just for that 20%, and be miserable!
I see a bit of truth in that.  I left my marriage because I was being totally taken for granted and not getting what I needed.  When we talked about it, she had no interest in putting any additional effort.  So why would I stay?

Every human being grows and changes over time when you're in a long-term relationship sometimes you get to a point where you need to redefine yourself and re-define your relationship .
 
A healthy relationship requires autonomy from both parties in addition to focusing on their relationship if you have kids you also need to create family time so really those are four separate areas that come into play

 You have to balance intimacy and eroticism -  getting along with the day-to-day grind of life yet appreciating each other as independent and sexual beings .  
 In the beginning of relationships we often talk about our boundaries and expectations what makes us think that as we get older and time goes on that we don't need to revisit these conversations ?
 It's called having relationship negotiations at different points in time as you change and I was your circumstances change .
 Who's to say that you can't read define your relationship into something that works for both of you even if it is not what society tells you that it has to be ?
 It's amazing how most people present themselves and their relationship one way yet when it really gets down to it they have created different rules and boundaries that work for them that are  different from what they have presented .
 So I found that normal is what's normal for you and you get to create that never let your religion culture or society hold you to expectations that are not consistent with you and your relationship Needs.