Your heart beats when they walk in a room, their scent drives you wild, you'd do anything to make them smile. Yes. You're in love. You want to spend all your time with them, gaze into their eyes, hear them tell you they love you. Thinking about them, a future with them makes your heart swell in your chest, and ache a bit. All you want to do is make them happy.
But falling in love isn't easy. It's not something that happens every day. You can't make yourself love someone. You just do, or don't.
When you do and they do, it can be wonderful, amazing, walking on the beach together, just standing holding each other. When you don't it's not so great you hurt them and you know you're hurting them and there is nothing you can do about it. When you do and they don't that also sucks, because shaking off love is very very hard.
Shaking off the love. How do you do that, when it's a series of chemicals telling you to procreate with that person? Where do you get the antidote to that?
Truth is when your heart decides it loves someone, there is no antidote. You're pretty much fucked, and for a long long time too. This is why there are so many songs and poems about the subject. There is actually a science dedicated to studying the biochemical, neurological and physiological imperatives driving the apparently haphazard choices we make as we fall in (and out of) love, and the psychological disorders that can result when love goes wrong. The science of heartbreak-love hurts.