I don't think I would define my relationship with T as interdependent, since he's not dependent on me. I think of interdependent involving reciprocity or a level of mutual dependency. With T, it's me being dependent on him. Period.

I see it more in my relationships with close friends or with my one sister that I'm close to. We lean on each other. Sometimes one of us leans a little more and the other holds steady, sometimes it's the other way around.