But he only remained a few months. When he had enough money to buy paints and canvases he left me. The place had got hold of him by then, and he wanted to get away into the bush. But I continued to see him now and then. He would turn up in Papeete every few months and stay a little while; he'd get money out of someone or other and then disappear again
Source: This passage comes from "Moon and Sixpence" by Maugham.
I am confused about the expressions "something get hold of someone" and "to get away into the bush" - what do they mean? The second I suppose means "to roam" by the first don´t have exact explanation.