You are confusing love with infatuation.
There is a difference between the endorphin rush/butterflies in the stomach and lasting love.
"Falling in love" is actually extreme attraction, which is why you don't have a choice in the matter. Sometimes this blossoms into real love which I believe is when you choose to stick with this person, even when they annoy the shyt out of you, or it is just not the easiest thing to do..
Ask any married couple who has been together for a long time and they will agree with me. I got this perspective from my grandma of all people. 50+ years of marriage and she loved my GrandPa till the day he died.
I remember telling her I was in love with a girl and she set me straight. She said "Fingers, that is not love. You have a crush and there is a big difference. Tell me, if this girl all of a sudden became very fat and unattractive, would you still feel the same way?" I had to admit I would have dumped her like a ton of bricks.
I also remember her taking care of my Grandpa when he had cancer. It was hard for her to watch him die slowly, but she stuck by him. Why? Not because she couldn't help it, in fact there were times when she would confide in me that she wanted to just put him in a home because it was too painful. But she made the difficult choice because she LOVED him.
Next time you think you love someone,
1) Picture them 100 pounds heavier.
2) Imagine yourself cleaning their bedpan everyday and helping them take a shyt!
Now THAT'S love, my friend!