There is a difference between a friend/spouse who accepts you for your faults and someone who wants you to stay where you are for their own benefit.
I've seen it a lot with friends in the past. You love smoking, its a stress reliever, you don't need to quit.... Why do you want to lose weight? I love you just the way you are...... Why do you want to get a new haircut? you already look beautiful.
People who convince you that you do not need to dream or strive for more and certainly scared that you will outgrow them. If you do get a better job, or lose that weight, or quit a bad habbit, or find a new hobby... A partner lacking confidence will see it as a threat.
Someone who defends your flaws is ultimately trying to suppress you from outgrowing them.