Happiness and Compromise

I have been thinking a lot lately about happiness and compromise. When we are young, we just expect to be happy and for good things to come to us, but as we age, we learn that life is a serious of compromises. I have been thinking about how each compromise we make to keep ourselves happy or a loved one happy and each compromise has to be considered in terms of what we are willing to sacrifice.
If you have a personality like mine, you probably are willing to sacrifice too much--sacrifice to the level that we compromise our way out of our own happiness. I have noticed that I am always on the wrong end of the compromise--eventually. Recently, I noticed that in some of my relationships, the other person is always asking me to compromise. When these people ask me to compromise, they often seem to forget that I have been compromising all this time. In fact, I get told often "You get the good with the bad" or "You have to be willing to make compromises." What I have come to realize is that everyone has a breaking point in terms of compromise. Part of compromise is that both people have to be willing to make sacrifices in order to meet in the middle.
Recently, I was asked to make a compromise that I know will make me unhappy. I know it will degrade my personal integrity and will destroy my plans for my future and the dreams I had about how my life will turn out. Now, I know that life doesn't always turn out how you imagined and that things aren't picture perfect. I also understand that compromises sometimes led you down a road that is different that your original path. I also understand that it is important to compromise and sacrifice for those you love.
Where do you draw the line? This is the question I have been wrestling with. Where do you draw the line and a compromise becomes too much compromise. Where does self preservation begin and selfishness end. I don't want to be selfish. I don't want to think only of myself because I find that selfish people are the most unhappy people. But, I do want to preserve myself. I have been thinking that I want to make the other person in this compromise happy (even though this person isn't compromising very much) and I want to be a good person, but I am faced with a compromise that will probably mean the loss of my happiness for a very long time.
Ok, so it seems pretty easy: Don't make the compromise. Right? Unfortunately, it goes back to that loving other people thing. It comes back to fear and all of those negative emotions.
What am I going to do? I'm not sure yet, but I hope as you are asked to make compromises, that you will consider your own happiness as well.... I'll let you know how it turns out.