lust or love?

how do one differentiate between lust and love? i think lust is short and love is eternity. therefore my liking for pullip is lust and liking for blythe is love. but i cant help falling in love with this latte pullip...
isnt she lovely?? is there any kind soul out there who is willing to get her as a gift for me in order to curb my lust?? ;)