“You’ll never lose weight. You’ll always be a very fat woman.”
Why would you stay with someone who thinks of you like this?
If you think poorly of yourself, you might just stay with a partner who thinks poorly of you too. While you may want the other person to think favorably of you, as you think more about the matter, you will decide that you are getting what you deserve. You will be more comfortable being thought of unfavorably if you have an unfavorable impression of yourself as well.
Although this may sound farfetched to you, research on self-verification shows that people with negative self-evaluations and low self-esteem seek to verify their self-perceptions, and they may do so by picking or staying with a partner who reinforces their self-perception.
As you may expect, the need for such negative self-verification from your partner will play havoc with your effort to drop your weight.