unpurity?

Does love usually go together with jealousy? when you seeing someone you like being happy with someone else, your heart start beating faster, thrusting anger to your head, then following by sadness... jealousy, is that love? does love guarantee ownership? when we love someone, do we have to own their body and soul? why seeing someone happy make us sad if we are not the one providing the happiness? is it not love then? what is it? what the fuck is love? is love measurable? does love last over time? is love logical? or is it just a by-product of infatuation?  does love come and go? is jealousy a bad thing? who define "bad"? ...shit i hate emotion, better to be a monk :/