It's a proven fact that our brains send electronic signals and chemicals to our nervous system and other various body parts in order to make us function. It's also a proven fact that the brain produces a chemical called dopamine, which causes humans to feel emotions of happiness, joy and love.
Yes, our brain's production of chemicals is the main reason we have emotions at all. But sometimes those feelings can be produced by other things, such as drugs. Ecstacy makes the brain produce a chemical called serotonin, which is what is produced to incur certain moods. It also makes your brain produce more dopamine that usual. So your feelings of love toward someone may be as artificial as a three dollar bill.