Rainbow,
here's my two cents...
it took a lot of self awareness to even ask yourself if you might have a dependency in this way. But even if it is true that you have it, why beat yourself up for it? Everything has a reason behind it and when the cause is resolved, the need will dissipate.

Your analogy of alcoholism is a little off, that's partly a physical dependency, not only an emotional one by any means. and BTW, alcoholism is the physical entrenchment of using alcohol as a coping mechanism for too long, and too hard. So, what if your perceived "dependency" on therapy is a coping mechanism too? it bears thinking about.

Lastly unless yr DH is a T or pdoc etc, why do you feel that he is seeing the issue in its proper light? Maybe he is just taking your stated fears at face value and isn't able to look more deeply to see the cause behind. You have made the VERY COURAGEOUS step of laying this before yr T for her guidance - I hope that whatever her response is, you can be at peace with it. And hopefully yr DH will be too.

OK, I guess that was three cents, not two. Peace to you