"You are what I have longed for in my dreams, what I have searched for, and finally found in you."
Let's break it down:
* "Eres lo que tanto esperaba..." - "You are what I have longed for so much..."
* "... en sueños buscaba..." - "In dreams, I searched for..."
* "Y ti descubri" - "...And I found you."
The phrase expresses a profound connection and the fulfillment of a deep desire. It suggests that the speaker has been searching for someone like the person they are addressing, perhaps even dreaming about them. The "discovery" of this person brings a sense of immense joy and completion.