People need other people. Depending on a partner or friend for comfort is not automatically a problem. The question is whether support can be mutual and freely chosen, rather than demanded at the cost of either person's wellbeing.
Support should go both ways
In a supportive relationship, each person can ask for help and keep their own friends, interests and decisions. Needing comfort does not mean either person has to be available every minute.
Notice when life is narrowing
If one connection is replacing most sources of support, or you feel unable to make ordinary choices without approval, it may help to rebuild other supports gradually. These signs are invitations to reflect, not diagnoses.
Practise asking and negotiating
Make a clear request and let the other person answer honestly. “Could we set aside time to talk tonight?” gives them a choice; demanding an immediate reply does not. A counsellor can help if fear or distress keeps taking over.