Give and take is key to any relationship
In any relationship, reciprocity or give and take is crucial for the health. One partner shouldn't take and take, without ever giving. There should be an equal or close to equal amount of giving and receiving. If not done, one party will soon tire out from the whole exercise and then it begins to leave cracks which ultimately will lead to it's collapse . And I bet nobody would want a relationship that is only one sided.
Image from Google.