Being *in* love is make believe.
Love isn't an emotion. Love is something you do to someone. Just like you hit someone, or kick someone, you love someone.
Don't let movies mess with your emotions. Joy, serenity, admiration. These are emotions. Love is an action that elicits these emotions. Loving someone is what you do so that they experience positive emotions. You want them to associate these emotions with you, and that's why you do the things you do.
Being *in* love is non-existent. It's what people say because they don't understand the fluctuating range of emotions a single person can influence. Therefore we chalk it up to this single mysterious force that is magical. It doesn't work that way outside of film, novels or music. There is no almighty force that brings two people together, it's a collection of selflessness and sacrifices by one or more people for another. You can love anyone, or anyone can love you, if they are so willing to perform the tasks that warrant positive emotional reactions.
Being *in* love is what marketers use to prey on everyone that has ever been confused by their emotions (you, me, and the rest of the world) and is also used by shitheads to let a friend down easy. "I love you, but I'm not IN love with you."