A friend of mine dated this girl for about a year, he asked her to marry him and shortly thereafter they walked down the aisle and lived happily ever after - for about six months. He lost his job and took a job as an insurance salesman. The first month or two the company paid him an actual salary while he learned the ropes, but after that it was 100% commission sales. He was having difficulty finding clients.
A lot of people are anxious to fall into love so much so that they try to make love happen. When things don't workout as they had planned they are instantly ready to throw in the towel and try again somewhere else. I know several guys around my age who have married the "love of their life" only to divorce about six months later. While the situations vary as to why the relationships ended, it typically involves (1) not knowing the other person well enough - or one or both parties not being fully honest with each other (2) money issues - this really needs to be discussed beforehand when things start becoming more serious, so both parties have a real understanding of where they are currently and set goals together so they can strive to meet their goals (3) And perhaps most important, one or both of the parties involved never really loved the other person.
Love is not something you fall into overnight and fall out of later in life. Love is not sex. Love is much more. Love is something that happens over time and is composed of a lot of little things that are just expressions of saying "I love you" without actually saying the words. It's making a meal, playing a game, watching a movie, going out on the town, it's helping each other out, taking care of one another, sharing time, talking, it's little notes and cards, it's stupid arguments over nothing, it's compromising, it's give and take, it's work - but worth it. It's knowing each other's likes and dislikes and sometimes just being able to look at each other and know what each other are thinking. Love is something that happens after sharing a million cups of tea or coffee. When you really love someone, you never stop loving them. It's not something you can fall out of - love is there, and despite any argument you may have with that person love will prevail because you love them.
When you love someone you don't care if they work in corporate or if they flip hamburgers - you see them for more than that and you see the potential they have, you reinforce that, and you help each other refine and become better together.
Love is something that happens over time and you end up falling into typically without ever really realizing that you are head over heels in love.