If you haven't received any other gifts or inheritances in the past, no tax is due yet, as 3000 per year (6000 - 3000 exemption) for 2 years is still below the threshold for gifts/inheritances from a stranger. Also 3000 exemption applies per calendar year, so if your friend started helping part way through a calendar year, even more than 6000 may be exempt.
However, if this financial help continues, you will become liable to gift tax eventually.
If you are married, your friend could split his gifts between you and your wife, then 6000 per year will be exempt (3000 x 2).
The same effect can be achieved, if you receive half the gifts from your friend and half from the friend's wife.