The idea that you must 'fall in love' to get married is something that evolved in our country from the middle ages. People grow up watching Romeo and Juliet and Disney movies where they learn when you meet someone for the first time, you can fall instantly in love, and if it is real it is magical, and it will last forever. Then they watch Lifetime network or Soap Operas and learn that when you fall out of love, you are supposed to get a divorce and find someone who will truly make you happy.
Romantic love is a good thing, and the Bible does talk about it. God does design us with feelings. But the idea that morality is based on our feelings and that you have to go with every feeling is very dangerous.
Then, people use 'falling in love' to mean different things. Some people think of a teenage infatuation feeling. Other people mean something deeper and more mature.
A single person could get infatuated with someone who would make a very bad spouse. Usually, people get infatuated by staring at someone they find attractive and/or thinking about them. They think and think about the other person until they get certain feelings. Then, drawing on all the movies and TV shows they've watched and conversations with others, they conclude that it must be right to have a relationship with this person, because the feelings that they got because of their own decision to think about the other person or stare at the other person. Or they think they have some kind or moral obligation to tell the other person how they feel. In some cases, this can turn out all right. But people will do the same thing with a married person or a poor choice of spouse (another religion, etc.) and think it is somehow noble to share their feelings. After all, the movies say you are supposed to tell the other person how you feel.
Proverbs 5 tells men to rejoice with the wife of their youth. Let her breasts always satisfy you. Always be enraptured by her love. so there is supposed to be romantic and physical love there, but the man has to choose to rejoice in his wife. Sometimes that's easy and it kind of comes naturally. Sometimes a man has to remind himself to do that.
One preacher was asked what he would do if he woke up one morning and realized he did not love his wife. He said he would get down on his knees and pray and repent until he did. The Bible commands husbands to love their wives. It does NOT teach that if you fall out of love with your wife you are supposed to divorce and find another one.