A large majority of the human relationship in this world revolves around a symbiotic relationship. In other words, the relationship exist because it is benefitial for both parties. Pessimistic? But there's nothing wrong with such a relationship. Both parties get what they want don't they? So everyone's happy.

When the situation becomes that where one party is always giving, imbalance sets in. Let's not bother if the person who is always giving feels bothered by the one-sided relationship in the first place, but somehow, this relation is fundamentally wrong. Nevertheless, there's nothing an outsider can say if the party giving wants to give and the "taker" don't find about problem about keep taking though.

However, it's when you find a person whom you are willing to give to without expecting a return, and that person too feels the same when giving to you. That's when this relationship should be cherished and nurtured with care.

p/s: the opposite of lateral's medial according to yiling. ^^ Thanks dear!!