What are some reasons why long-term couples do not marry?

Anonymous
I've known couples that had been together for 10+ years and hadn't been engaged or married. I've also known couples who had been together for 10+ years and just got engaged. I also heard a woman said that she and her boyfriend had been together for 13 years or so and they did not plan to marry.

I would think that if these couples were together for that long, they love their partners and they were not staying unmarried because of lack of commitment, so what are some reasons why long-term couples do not marry?

Are there benefits of not marrying, for couples that have been together for a long time, are happy with each other and not thinking about leaving the relationship?

I just want to gain insight into this approach to long-term relationships. I personally would want to get married, and it's for the symbol of marriage - the union of two people. I'm not referring to the wedding ceremony, although this rite of passage would add more meanings to the experience. So I would want a marriage, but would be fine not having any kid.
What are some reasons why long-term couples do not marry?
14 Opinion