A relationship of dependence cannot be a healthy relationship. A relationship in which the other becomes central towards your well-being is not a welcome situation.
In fact, the other that has become central to your well-being, is he even worthy of offering you that wellness? Chances are he might himself be seeking that wellness from you or elsewhere.
Being incomplete, you are seeking completeness from another incomplete one. Classically, it is called the case of two beggars uniting in the hope that the union will produce a billionaire. It does not.