Respuesta :

 In the beginning, when you have butterflies in your stomach from meeting someone new, dopamine levels surge. All that dopamine gives you an extra thrill when you see your newly beloved, creating an intense craving to be around them. A neurotrophin called nerve growth factor accompanies all this euphoria and increases your emotional dependency. Lastly, serotonin levels drop, which cranks up the dial for desire. This chemical cocktail is why lovestruck couples can be so infatuated with each other. Overall its to reproduce. If you're looking for a more human answer, post the question again in English category and I'll give you the philosophical answer instead of the chemical. On another note- you okay there?
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All animals want to survive. With this in mind, lets talk about some natural drugs that your body creates to create this feeling of "love".

P.E.A. is a natural anti-depressant that the body makes, kind of like dopamine. This is the most affiliated with the nickname "love drug". It creates the need to reproduce sexually. This is the primal instinct; to reproduce and pass on your genetic material.

Now, as you stay with one partner, you may find that the feeling changes a bit; this is P.E.A. turning into oxytocin. This is a deeper kind of love that humans develop once they have been with a partner for long enough. High levels of oxytocin are found when a mother has a child, usually found during breastfeeding.

There are many natural drugs that your body produces to create the feeling of love. If you have any questions, let me know! Hope this helps!