> Relationships should be maintained while they are mutually beneficial, if the benefits are once sided, there is no reason to keep it.

What if the relationship has always been one-sided, but was entered into in the expectation of future mutual benefit?

There is certainly something to be said for two sides agreeing that there is no longer a mutual benefit for each other and choosing to go separate ways. But not for one side to unilaterally decide that they have extracted all they can from a relationship and unilaterally decide to therefore end it.