This is such a common thing and it's becoming more and more common since women entered the workforce. Respect for women in a relationship can be what physical attraction is for a man, without is sex dries up.
The only thing I was pointing out is that melding together completely as a couple dissipates eroticism, uncertainty and that sense of 'other' that creates excitement. Communication can begin to take a form that slides towards contempt rather than honesty. If you find yourself saying 'You ALWAYS say this" or "For god's sake, why can't you ever.." you're beginning to talk to your partner in a way you wouldn't even to a colleague you have no affection for.
Often when a couple finds a huge problem (like an affair) comes up they communicate really honestly for the first time in a long time and respect comes back for a little while and so attraction.
And also frequently the blame for a lack of respect goes on the man (lazy, shiftless) in a couple when it takes two to tango and if you find yourself seething, waiting silently for him to 'do' something you wish he would do, then find he doesn't, then judge him for it and do it yourself, resentfully, thinking 'I have to do everything' that sort of passive-aggression is a way of continuing a cycle of lack of respect for your partner and maintaining control.
Of course sometimes in a relationship someone is just a bit of a weight dragging the other down, and there are definitely men out there who command much more respect and have huge amounts to offer, so sometimes it's right to leave a relationship that has this dynamic. But truthfully, men like that bring their own difficulties and can be distant or not as fun or even unfaithful, so you pick your flaws!
The issue of life partners is a knotty one, Confused, but it's not something you need to take refuge in, it's so general. For all time people have swapped partners, mated for life, been unfaithful, monogamy or love is a timeless clusterfuck. The real question is. is HE the right man for you. Did you marry the wrong person. Stop thinking about 50 years and think 5 years.
Most of the time:
Can you have fun?
Do you feel safe?
Do you respect him?
Can you be physically attracted to him?
Do you find him mostly easy to be around?
If there's a resounding no there, deep in you, and even by addressing it openly and effortfully it doesn't go away, you should feel content that you would be happier if you left.