"
good for, what you good for?
If you give it a name, then it's already won.
What you
He's saying, "If you name what has happened in the past that has made you so anxious, the problem will be halved and I will be able to help you or make you feel secure again because I care about you." The "What you good for?" is sort of him saying, "Right now you're being silly for not thinking you can talk to me about it."