QUICK ANSWER
"How are you doing?" is a phrase which is often translated as "¿Cómo estás?", and "hello, dear" is a phrase which is often translated as "hola, cariño". Learn more about the difference between "How are you doing?" and "hello, dear" below.
How are you doing?(
hau
ar
yu
du
-
ihng
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (colloquial) (used to address one person)
A word or phrase that is commonly used in conversational speech (e.g., skinny, grandma).
a. ¿Cómo estás? (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
How are you doing? - Fine, thanks.¿Cómo estás? - Bien, gracias.
b. ¿Cómo te va? (informal) (singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
How are you doing? I hope that everything is well with you and your family.¿Cómo te va? Espero que las cosas les vayan bien a ti y a tu familia.
hello, dear(
heh
-
lo
dir
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. hola, cariño
Hello, dear! I haven't seen you in a while.¡Hola, cariño! Hace tiempo que no te veo.
b. hola, cielo
Hello, dear! Are you visiting your grandma?¡Hola, cielo! ¿Vienes a visitar a tu abuela?