When do concepts like compromise, sacrifice, yielding, or giving in become things of beauty and nobility? When does holding on to your lofty ideals with an iron grip no longer seem so valuable a trait?
When you bond with someone, that's when. Being with another person for the rest of your life takes a lot of searching for middle ground, and when it's a good relationship for you both, those compromises aren't bad things. They are wonderful ways of showing your deep love and devotion.
The concept that compromise makes you less valued in a relationship is false. Not compromising is what happens to that pampered child that never learned to share. A partnership is made of two people with a lifetime of individual experiences, not two puzzle pieces that fit together seamlessly. In a good pairing, neither is so important that they are exempt from having to give in once in a while. And sometimes the compromise is a very big thing and the sacrifice great. That's just how things fall sometimes. To expect to never have to change and yield is being that child throwing a tantrum because “it's just not fair!” A sense of fairness is acknowledging that sometimes you win, and sometimes you lose.
If it's such a very big deal to lose to someone you love once in a while then it's time to look hard at your commitment to the relationship. This is what they mean by growth. It takes more strength of character to change and evolve than to stick to your guns just because you believe that your idealism is most important to your sense of self.
Being a partner means things aren't all about yourself any longer. It takes maturity to accept that there needs to be a dual, equal importance that is enforced from both sides. It takes integrity to admit mistakes and work your way back to equality. It takes wisdom to admit that love isn't enough if both sides aren't willing to embrace the work it takes to make a life together.
Real love, true and abiding love, is when you are willing to make the sacrifice of selfish, not the sacrifice of self.