I would concur with Bill's interpretation: the act of truly celebrating someone else's happiness, even if you're not part of the equation, is an act of true love...
Yes I think this is exactly what true love is...regardless of who the love is for...a child...a parent...a friend and yes...a romantic/lover whom we ourselves may dearly love to have in our lifes but sometimes find that, that is not meant to be.
It poses an interesting question...should you allow yourself to fall in love with someone knowing that if the relationship falls short (aka you aren't the person they love and desire to be with ultimately in the end or vice versa) risking the typical response our outcome of separate which causes pain and hurt to both parties...or do you set your own personal bar so that the only acceptable outcome will be this unconditional love that enables the other person to choose their needed path of happiness regardless of whether it is with you or not?
If we committed to the latter path...the one that is obviously ideal...how many relationships would we really enter into? And how many people would we really profess that we are in love with or allow ourselves to fall in love with?
Perhaps we'd be more cautious of entering a relationship if we adhered to this...and perhaps we'd treat the relationship differently being focused on this new ideal vs. being focused on ourselves.
As David said...when you ask for help either that the Lord's will be done and not your own...or you focus on the "happiness" of the other person rather than your own... you are more likely to reach a greater and more true level of happiness for yourself.
Just absent minded ramblings from a perpetually single female!