Not to sacrifice yourself, as in who you are. But making sacrifices for the betterment of the other person. Like a friend who needs to talk at midnight even though you're in bed. Things like that. The less you're willing to sacrifice, the less you probably care about that person; the more you sacrifice probably the more you care. But you should never sacrifice who you are. If they care about you, they'll never ask that of you.

This hits close to home for me. My sister thinks she has to be submissive in her relationship in order to be happy. But she is losing herself. Then she has outbursts of anger, depression, anxiety. She is completely unhappy. But she doesn't realize she's in a vicious cycle. She just wants her boyfriend to love her. Sorry for getting off track...