Relationships are about not only taking, but also giving. If you find yourself not giving very much, or feeling resentful of how much you give and how little you receive back, you may be in an unequal relationship where one side is taking more than they are giving.
For instance, couples sometimes mistakenly believe that love will help them deal with any issue that comes up, and that if the other person truly loved you, they would just do as you ask. But people are independent with their own unique needs and personalities. Just because we found someone we want to spend our lives with doesnt mean we give up our own identity in the process.