nothing last forever

when we're in love,our brain releases a certain set of chemicals, including pheromonse,dopamines, noreponephrine and serotonin  which act in a manner similar to Amphetamine,stimulating the brain's pleasure center, and leading to side effects such as increased heart rate,loss of appetite and sleep, and an intense feeling of excitement. Research has indicated that this stage generally lasts from one and a half to three years.