Why does Pip refuse to take any more of Magwitch's? do you think he made the right choice?

Pip is initially repulsed at the revelation that Magwitch was his benfactor and said he wouldn't accept anything further. He was also devastated that Miss. Havisham was not his benefactress and had no intention of helping him. Pip's dream of becoming a gentleman of means was purely based on his desire to make himself worthy and marry Estella. His belief that he was sponsored by Miss. Havisham led him to think that she approved and wanted to assist him in his endeavor.