if were taking a biological standpoint then no its not. nature has set things up to make us feel that initial lust for people and thats what most associate with love is the passion. they feel that once the passion is gone, the love is gone too. primates are no different than any other animal. we want a person for a few years then after about 3 years our bodies are ready to have another baby again. (or the first one). then we start to reexamine our partners and usually pick out flaws so that we can find a better, more fit, mate. (fit not necessarily meaning buff). its just evolution. thats how we work. very rarely are animals in the wild purely monogomous. and if they are its usually social monogomy like in birds. they might have one mate, but they might fly around and if they find a better one, mate with them once during the season. and their ideas of monogomy are different. monogamy is usually just for that season. religion is usually what plays the biggest part in determining that for people and other animals dont have religions or rational thinking. thats why we torture ourselves like this.

humans greatest achievement is also the biggest downfall. intillect is what has kept us alive for 120,000 years but in the end its what is killing us.