There are some aspects that can indicate that you are dependent on your partner:
1) People who are dependent demand a lot of attention from the partner. In this way, they fill all the emotional void that they have. If this attention is not what they expected, they get angry with great ease.
2) If you are dependent on your partner, you will need to spend as much time as possible with the other person. It is an absorbing relationship that usually takes its toll on the couple over time.
3) People who are dependent do not want to be alone at any time and need the affection of their partner.
4) The fear or concern of losing the other person forever is another of the clearest aspects of dependency. They may put love or happiness before being alone.