Why do some people fall in love and marry and some don't?

Everyone is, by definition, an individual. Everyone's relationship with everyone else with whom they have a relationship is, likewise, individual. Even the time and place people are in their lives have an impact. The contributing factors likely aren't infinite, but there are enough of them as to make no difference.

If you want to get married, then you have to keep in mind three things between you and your potential partners — means, motive and opportunity. Do you and your potential partner(s) have the resources available to make marriage a viable and desirable option (means)? Do both you and your potential partner(s) want the same things out of life and have reason to believe that the other can help provide them (motive)? Do you and your potential partner(s) interact in such a way that you both could consider marriage and neither has any significant impediments (opportunity)?

The falling in love part, though, is a crap shoot. I'm going to speculate that a lot of people never actually fall in love with their future partners before they get married — what they do is find that they're reasonably compatible. "No, I'm not in love with you, but I like you well enough and I think we can have a successful partnership together." Some people fall in love and get married; some people fall in love after they've been married for years. And others can never make it work no matter how much they are in love with each other.

So, crap shoot.

Have you ever been in a serious relationship?

I've never been married. I remember looking at my parents when I was quite young and thinking if that's what it's like I never want to get married. And I haven't.

That is what society expects of you. Your parents want you to be secure happy, and to have grand children. You just want security, love, sex on occasion, possibly food, and a dependable friend. A good night's sleep is not a likely outcome. So you do it and a few months into it you start to notice things. Things that they do that are strange. Months turn into a couple years and you're paying for marriage and mental health councilors, chiropractors are you going her more than you can and In my case a series of events in her young life erupted out of the blue and led to hospitalizations and all sorts of mayhem that even after having a child there was no refocusing on the marriage so she departed for space and solitude.

"There's no accounting for taste.", said the old woman as she kissed her cow.

Many men want to lay you down, but few want to pick you up.

I don’t have the answer.

As a great friend mused, “It beez that way sometimes “

Some don't want to be held down, some do.