Dependo de ti. (Estribillo de una canción de Shakira)

I depenD on you = "(Yo) cuento contigo"

There is no way to say that with one or two words. Because that word, if it exists, it would have to mean all the world's words, because it means everything. If you let me give you a humble advice, I think it would be the best to tell that with the eyes. ;)