I believe it is easy for us to say we love someone when we don't have to make any sacrifices. I personally believe that part of love is sacrificing some of our selfish desires. I also believe that sacrifice builds compassion within us. I believe it builds a spirit of a servant and character which in turn makes us more attractive in the eyes of our mate.
I do believe we are meant to be monogamous relationships and that with it there will be pain. We are human and we are not without fault. We are going to hurt one another, but that hurt brings with it the opportunity for forgiveness and growth. It is in our pain that we are forced to move. Which direction we choose to move in is up to us. In other words we are driven to grow. Unfortunately, many people take the easy way out because they do not realize that pain is a part of life and that pain is a vessel for growth.
While I may not like 'hard times' in life or in relationships, when I look back on my life I realize it was in those times I grew and I dare not want to think of the person I'd be if I had not had those opportunities.
I've learned to stop fighting the hard times that come my way, not to say that I do not tire of them at times. I embrace them because I know that something beautiful can develop from difficulties. And when a couple realizes this together, the sky is the limit to level of closeness and intimacy they share.