Big problem with data usage! Help please

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http://androidforums.com – Hello, for the past two months I have been having a problem with my data usage which never happened before.... I have a one gig plan that I never went over until recently. Last month I have used about 6 gig and this month I'm almost at 16gig! I don't u derstand how this can happen because I don't do anything more than I used to... no facebook, no YouTube... When I check my data usage it says that android manager is the big user; 15.25gig and browser 335mb... What is android manager? I suspect my boyfriend installed it to spy on me and listen but I'm not sure... when i read the app details (General)