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Hey tripudium!
I'm not sure what your present position is but I'm guessing that you are a new believer or are about to be and you are in a relationship with a girl who may not be... ::lookaround::
If this is your position at the moment, my suggestion is that you be straight up with her. Perhaps if you tell her the good news, she may also wish to take the path that you are on or she may not. If she decides to follow you as a believer in Christ, your relationship (if it is physically intimate) would have to change anyway...
It is a hard decision to make but accepting Jesus as our Lord and saviour is the best decision that anyone could ever make for their life as it far outweighs anything we have or could ever wish for because this life is only temporary and we are looking forward to an eternity with the one who loves us and gave his life for us (John 3:16) so that we can be where he is forever.... ::smile::
Blessings!!!