The most telltale sign of codependency is a repeated pattern of putting the needs, well-being, and self-care of others over your own. Other signs of codependency include changing your mood based on how the other person behaves, doing things you don’t want to do to make the other person happy, having self-worth or self-esteem that depends on what the other person thinks of you, or neglecting your own desires or needs to please or fulfill those of your partner.