Is Great Britain falling out of the European Union?

I know that this is not the section to ask this question in, but I am really familiar with this section. Anyway, i was talking to a friend about how I love to be a British citizen, which gives me the permission to travel to, work in and live in any country in Europe without the need for a visa or greencard or anything. But then he ended up saying that Britain/England/UK (yh sorry, I dont really understand the difference) is not going to be in the EU for long. Is this true, Is Britain getting kicked out of the EU, if so when?, If not then, is there a chance that will happen in the future (in the next 50 years)

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