How do you know when you are in love with someone? I need  full essay draft Theoretically, no one ever really knows when they are in love. When it comes to science, love happens when certain chemicals are released, specifically oxytocin. Anyone that is in love, of course, would not say that it is a chemical reaction. They would tell you it is an emotional connection. When you are in love, you are always thinking about them. You get nervous whenever you see them. You become selfless; you are no longer just thinking about you, you are thinking about them too. It is no longer just a physical attraction, it is more than that. Although love comes in many forms, everyone will get a similar feeling when they are in love.