Your brain secretes three chemicals, phenethylamine, dopamine, and oxytocin, when you begin to fall in love. These chemicals have a major effect on your emotional behavior. Dopamine in particular is associated with your brain's "reward" pathways, meaning feeling "in love" is something your brain enjoys and wants to experience more of.  During the initial phases of love, you may notice a heightened mood, high self-esteem, and a tendency to do things that are out of the ordinary for you. For example, you may be inspired to perform grand romantic gestures like buying expensive gifts.  You may also find yourself preoccupied, constantly checking your phone, e-mail, or social media pages to see if this person has reached out to you in any way.  You may also experience certain negative emotions. You may have a heightened fear of rejection and experience sudden moods. You may replay key moments over and over, worrying that your first kiss wasn't quite right or that you said something that sounds silly at dinner. The mental response behind love can cause acute feelings of longing. If you feel acute longing, even after short periods apart, you may be in love. Due to the chemicals released by the brain during love, there are a number of physical responses as well. It might be love if you experience any of the following:  Increased energy Loss of appetite Trembling A racing heart Difficulty breathing Physically, you will experience desire for your partner. This should not be solely in the form of sexual desire but also manifested in a desire for touching and cuddling throughout the day.  Oxytocin is what drives your physical needs when you're in love. It's sometimes referred to as the cuddling hormone. You'll find yourself wanting to kiss, cuddle, and touch your partner throughout the day. You'll want to have a heavy amount of physical contact with this person at all times.  While sex is an important component to falling in love with someone, it likely will not be the most important factor. Most people in love find that an emotional connection with their partner is more important than a merely sexual one. If you're in love, you will feel like your relationship is more than just sex.
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