Why do people stay together if there is no more love?

Why do people stay together if there is no more love? No, idea.
Why do people fight, beat each other in form of their juvenile kids and other family members, but still stay together?
Why women take beatings for granted and stay in the hateful marriages?
Sincerely, I am completely confused by that thing. Especially with the marriage who are tested by the violence and drunk husbands.
Or drugged ones. When I read about celebrities with money, every second was high on drugs drinking and stomping poor wife but nobody has done more but news people who filled the tabloids for the sake of money and audience reading the newest gossip. How rude…
And when a woman comes out, they victim blame her and drag across the mud like if she was asking for that.
People are nasty I know because they refuse to believe that a sweet person outside is a wife-beating monster at home.
If you don’t love somebody, you should flee and find the better fitting partner, because it is obvious that the present one is not good enough for you.
But, love struck people are not easily shaken off of their bad habit of falling for the less fortunate with no brains and manners.
They think it is that something. maybe a special flavor of a rotten character drives them crazy, I don’t know.
So, why people don’t come clean and admit they don’t want a relationship anymore? A reason is very simple, they will rather ruin it with infidelity and unhappy rather marriage but to admit they ‘gave up’. In the fact the is no giving up, but simply not fitting together.
Infidelity is not always an accident that just happened, sometimes is a punishment performed and served to the unfitting partner who refuses to see the reality.
When it comes to that, two are blaming each other but never on himself because that other must be the first who ruined ‘s something so perfect’. But, there was never something perfect, because if it was there – they will never think of going to the way they went, yes?
I believe it is so, people will rather do this and the is also one another reason. A law. There are consequences to bear if any of the partners decides to quit on them marriage, even if it is unhappy and bitter for the both. A society gives the consequences, and a community alike. Because the people always look who is a guilty one but never takes it as a natural end of anything that never meant to be. It si over, bury it and move on. But, no! A community will label and sometimes even punish anyone who admits in this way to be less than a perfect, even if it is better ‘perfect’ being single but in the rotten marriage.
There is also another thing when a marriage ends with children. If there are children involved then there is an entire circus.
I can’t imagine how anyone survives such a harsh labeling. This is a reason why many martial partners stay in the unhappy marriages and bare the consequences of a hateful life.