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Brother had Melanoma.... BUT now has Brain tumours? - melanoma brain

One of my brothers were) with melanoma (skin cancer, the worst serious ..... diagnosed could be heard, remove the black spot, it was cancer, lymph nodes were removed in the neck.
He was given the green light, until 3 months later, his eyes began to look different and it was easy to move to the left ...... The oncologist said he had tumors in the brain, and there was nothing I could do?
Does this mean that your cancer has metastasized? and not at all left?

Try to understand what went wrong ?????