The same thing happened with men when women compete for men's time and attention.
Love is one of the biggest deals in the west, the bond that (in theory) forms the foundation of homes, and it is the peak of a woman's power to catch 'that' man and becomes princess for a day heralding her new life. In reality it only makes women useful for one thing - to love and be loved and then reproduce.
Especially with the only role for women in most films is being the love interest, needing to be rescued by some man who by the mere fact he rescues her means she'll fall magically in love with him and henceforth they'll live happily ever after.
Having a partner can be extremely useful. Having someone who is on your side, who will help you makes life easier. Most often because it allows us to multi-task, we can do more things than we might normally be able to do by ourselves. Our partner is that special someone we can trust. They help alleviate loneliness, we do stuff with them for entertainment, help us enjoy life and stop us from feeling sad when things don't go well.
Friends can often help with much of this. And sometimes friends can be as good or even better than a partner in many ways, depending on the partner and friends.
Our society conditions women to put up with atrocious behavior from men because women have been told it is better to have a man than to be without. Often that atrocious behavior constitutes domestic violence and addictions or even extramarital affairs or just plain bad behavior, like put downs or insults, because women after they hit a certain age don't want to feel the need to get another man.
Men are very emotional, much more emotional than women. This is a large reason we coddle men so much is because we don't know when they will get so emotional they'll grab a gun.
A lot of this bad behavior comes from women letting men get away with terrible behavior. Often we let bad behavior slide hoping it is a one-off thing but then it becomes increasingly bad and sustained that the woman ends up not being able to control her outrage at how bad the man's behavior has become and she scolds badly all the time whenever she sees the man. Is it her fault that the man's behavior is bad? No. The man should have controlled himself in the first place. These kinds of men will trumpet on about 'Love means never having to say they're sorry'. But of course that only works if they don't demand endless apologies for the slightest perceived insult for what they consider as bad behavior in others.
The problems come about because people don't treat others as equals. I remember one man telling me when I said I wanted to be treated like an equal, "no, you want to be treated like a woman". I don't even know what that means. This person didn't even respect me enough to listen to what I wanted and assumed he knew better.
We must train women and girls who want to form partnerships with men that they should NOT put up with appalling behavior from men or other women. Men must lift their game in dealing with relationships. Men have been getting off too easily for far too long and we should not put up with it anymore.