BBJ, when you have time, try reading Passionate Marriage or try to find the principle of differentiation Vs fusion.
You can sacrifice things for the one you love, only if it is a concious choice you can live by and you do it on your own, no manipulation, ultimatums, fear involved.
Then, it becomes no sacrifice anymore. You decide to do it. Some people just throw the responsibility to others when their choice turned bad. There is subtle difference I cant explain well.