Bro you my guy but you sound crazy right now and it sounds like you have no experience with women (which im sure can't be true).
Do you know how hard it is to make a woman happy? Women's emotions change with the wind. If you're basing ANYTHING on the state of their happiness which can be up and down at any moment, then you will be ass out in the cold looking like a fool because you will have no stability at all.
What the brother above is trying to get you to see is that if everybody leaves a relationship because they're unhappy, NONE OF US WOULD BE IN RELATIONSHIPS. Everybody has the feeling of unhappiness at times, even lingering unhappiness.
But the whole point of marriage vows is that you're vowing to stay, yes, even during the times of unhappiness.
Unless something major happens, that's a commitment that you made.
Basing commitment on fleeting feelings of happiness is ignorant. Especially for women, whose feelings are often more fleeting than stable.
I don't think it's a man's responsibility to make women happy, I don't even think it's possible to make someone happy.
I agree that we all have moments of unhappiness, it's one of the reasons I decided to give therapy a try. If that unhappiness can not be overcome then staying in a failed relationship doesn't benefit anyone.
There's no shortage of people that have been miserable in their relationships for years and feel trapped, do you think those people should just stick it out because they made a commitment to do so? I don't think so. In reality, many people aren't leaving because they can't afford to which leads to them having to escape the relationship in other ways, including but not limited to infidelity on the extreme end of the spectrum.
She was married to him for 10+ years before deciding to leave, it's kinda unfair to attribute her exit to "fleeting feelings", it's more likely that those feelings of unhappiness were persistent.