I'll be here for good this time.

I'll be here for good this time.
I'll be here for good this time.

I'll be here for good this time.
先用英语解释
I am back for good means I am back to stay permanently.
中文的意思是
这次我会来,不再离开.

这次我将在这里获得利益。

for good 永久地；一劳永逸地
这句话的意思是“这次我将永远在你身边”