A good deal whether I ever forgive you

A man did sth wrong to a girl ... he begged her to forgive him ... and she said:

"It depends upon-a good deal whether I ever forgive you."

What this means? Did she forgive? ... Thank you.

I don't understand that sentence. How about:

"Can you ever forgive me?"
"It depends a good deal on how you treat me in the future."

Deal as in Meaning 2(from Merriam-Webster):
2 : a usually large or indefinite quantity or degree. A great deal of support. A good deal faster.