There are a lot of women who do not want relationships and prefer to be alone. With others they do not need a man in their life, they are quite happy on their own, their life is full with other things, and they see no advantages to changing this state.
Years ago any woman who was single was looked upon as a spinster. A poor pathetic soul that no man wanted. It was assumed that she had been unable to find someone willing to take her on as a wife.
Nowadays women get offers to get married, or live with someone, which they reject. Not because the man who is offering is horrible but because they prefer to be independent, single and living on their own.
The man is fine, lovely, but the relationship the man is offering is not acceptable. For such women anything to do with living together or being married is a no no. They might agree to see the man every day.
But they will not agree to be tied to him every minute of every day, wash and iron his clothes, cook all of his meals, listen to all of his problems, or explain to him where they are going and why.
With women working and standing on their own two feet financially many women have no need to sacrifice their independence to please a man.
If the woman is of mature years she may have tried marriage, and find it stifling. It may have put her off of marriage altogether. She may still be looking for Mr Right and not willing to give up her independence and single status for an also ran. Or she recognizes in herself that she is cut out to be a loner, and would not marry anyone at all. Some women have very little money yet still prefer to be single. They are not bothered about what their friends or family think. All that matters to them is that they are content. If they have a few financial hassles along the way then so be it, it is worth it, and far better than being unhappy or bored. I know a lady who is 73 and has quite a few financial problems, she has to continue to work despite health problems, yet she vigorously defends her choice to live alone and not be in a couple. Her life is full of other things and she values her privacy.