"Estoy completamente dedicado a ti."
Translation:I am completely dedicated to you.
To answer my own question, and yours Ranchers, it seems that even though characteristics use "soy", states of being, even if they are permanent (as my wife would hope), use "estoy". Hence "estoy vivo" and "estoy muerto" despite nothing being more sure than the former, or more permanent than the latter.
Don't use temporary vs. permanent as a way to decide between ser and estar, because that will just drive you batty. I teach my students that estar is used mostly for location and condition, and ser for everything else. Estar is also used for certain set phrases, this being one of them: estar plus a past participle used as an adjective. "Vivo" and "muerto" from your examples, jellonz, are also past participles used in this way, and therefore follow the same rule. http://www.studyspanish.com/lessons/pastpart.htm
why is "estoy" used here and not "soy"? In previous examples "fue" was used to express " he was dedicated" and "fue" is "ser" not "estar" - it seems DL goes back and forth with ser/estar and these types of adjectives ( pagado/pagada, deidcado/dedicada) so do you use ser or estoy with adjectives...??
"Estoy" here denotes a state of being. If you used "Soy" that would change the meaning to a characteristic. This was probably the case in the examples where jjcthorpe saw "fue" used: eg "El fue dedicado"="He was dedicated"=""He was [a] dedicated [person]" - Characteristic. Whereas "El estuvo dedicado"="He was dedicated"="He was dedicated [to something/someone]" - State of being. You can't use "Soy" in this DL sentence though because of the "a ti." This "to you" makes his dedication a state of being towards someone instead of a characteristic.
It's ok, but we tend to use "committed" more with abstract ideas rather than people. So we might say we are committed to a cause, or committed to a job etc. If you said you were committed to a person it would probably be understood as saying you are committed to the relationship you have with that person.