How To Keep Loving Without Reward? Changes can easily come about in all of us, even those we love and trust.
When this happens, how do we keep loving them without expecting anything?
I think this is a question we all ask ourselves at some point
http://buddhism.about.com/od/basicbuddhistteachings/a/attachment.htm


  What Is Attachment?
  
  In order for there to be attachment, you need two things -- the
  attacher, and the thing to which the attacher is attached. In other
  words, "attachment" requires self-reference, and it requires seeing
  the object of attachment as separate from oneself.
  
  The Buddha taught that seeing oneself and everything else this way is
  a delusion. Further, it is a delusion that is the deepest cause of our
  unhappiness. It is because we mistakenly see ourselves as separate
  from everything else that we "attach."
  
  Zen teacher John Daido Loori said,
  
  "[A]ccording to the Buddhist point of view, nonattachment is exactly
  the opposite of separation. You need two things in order to have
  attachment: the thing you’re attaching to, and the person who’s
  attaching. In nonattachment, on the other hand, there’s unity. There’s
  unity because there’s nothing to attach to. If you have unified with
  the whole universe, there’s nothing outside of you, so the notion of
  attachment becomes absurd. Who will attach to what?"
  
  Because we think we have intrinsic existence within our skin, and
  what's outside our skin is "everything else," that we go through life
  grabbing for one thing after another to make us feel safe, or to make
  us happy.


Living without attachment is a lot like living without trying to get some outcome in the world. It is living life but not defining ourselves essentially as a companion or a worker or a studier or being just the body.

So not being attached or not having expectations involves loosening up our own self identity that is wrapped up in the world and how it appears. If we are totally comfortable in this moment it is far easier to accept the relationship we have with that person.

Keep practicing meditation every day and have meditation be part of your relationship could be a good start.

Thank you