1. Low Self-Esteem
Low self-esteem is found to be the biggest predictor of codependent behavior in one study. People in codependent relationships require the approval of the other or, at the very least, must be of service to the other in order to feel fulfilled. Or they have to rely on their partners to satisfy their financial needs and need affirmation from them. The dependent person frequently worry about that their partner may leave them. But in a healthy relationship, people are equals and should be confident in themselves.
2. Lack of Boundaries
Lack of boundaries is not uncommon in a codependent relationship. In such a relationship, one tends to give way too much attention to the other while the other is willing to receive that. To put it another way, the attention giver or care giver is generous, maybe too generous to see the need of boundaries. The other may be quite happy to be the receiver at the start but he/she will see the consequence. He/she may not have a say on many matters, including some important ones. He/she will be overwhelmed with frustration and depression. This, of course, will do no good to the relationship.
3. Isolation from Others
It's an indication that things aren’t quite right when you start losing touch with those who matter to you. You begin to notice that your full concentration is on the other person, to the point where you become increasingly separated from formerly essential individuals. If so, you will grow progressively reliant on your partner. And when you realize that he or she is not the right one for you, you will find yourself with no friends, no interests, and even no life goal. In this case, your life is easily dominated by your partner. Simply put, it is critical to maintain your own life and have your social circle even if you are in love with someone.