Peony yes, there are absolutely people who just don’t believe in or want to be part of marriage at all. I am one of them. I’m a woman. My reasons are as follows:
I think the history of marriage - while it may not be like this today - is incredibly sexist and patriarchal and about ownership of women
I want to keep my finances entirely separate, and I do not believe I’m responsible for the financial well-being of another adult. Everyone should strive for financial independence as much as their circumstances allow, and I probably wouldn’t even entertain dating someone who would need to rely on me financially.
I think marriage upholds sexist roles for men and women - men as the provider and women as the homemaker. This negatively affects both sexes, by putting undue pressure on men, and disincentiving women from being financially independent. I find it incredibly sad that some women think their personal value is raised by being a wife or mother or having their husband’s surname. That is the definition of patriarchal conditioning to me.
I want to be free to leave the relationship at any point I choose at no cost. It may last forever, or it may break down after 10 years or 6 months. If that happens, I want to walk away with the same assets I came in with.
If I wanted children, which I don’t, I would have lengthy discussions beforehand about the division of labour. There is absolutely no way I’d give up my career - I would theoretically only consider having children with someone who would split everything 50/50 including both of us reducing our working hours if necessary. I would not stop working so I feel it would be unfair to expect my partner to be a SAHD unless he expressly wanted to. If he did, and it was financially viable, I’d support him with a monthly allowance and the agreement he’d go back to work in a couple of years. If this arrangement was switched I would also find it acceptable - I’ve never been able to get my head around the concept of feeling like I’m entitled to access money I haven’t physically gone out and earned.
When I’m dating I make it clear very early on that not only am I not interested in marriage (and kids), I’m actively opposed to it. If it becomes clear the other person wants that in their future, I simply won’t continue seeing them because it’s something I won’t compromise on. It has no bearing on how much I might love the person - this is about me, my personal ideology and beliefs and I don’t see why they should ever come second to someone’s desire to marry