Manasikara's adivce is worth listening to (in my opinion). So I agree totally.
I've been practising quite seriously for 5 years (actually from the very first day I discovered Dhamma). And I'm still married (since 2002), I have a wife and daughter. And "as I know and see it", up till now, even living in a family, I managed to decrease lust a lot through constant practice of the Noble Eightfold Path. I had numerous sensual attachments, including sexual, and I weakened them much. So I can even make a small lion roar like "Yea, it really works!!".
But one thing I would add about getting rid of addiction to sexual things... Once lust will occupy your mind - observe it carefully, and do this in such a way, so you see extreme suffering in it (and indeed, it is really painful, this sexual lust). Then do whatever you want to have a relief (of course, in the frames of 5 precepts). Time will come, and your mind will incline to sexual things less and less and less - because it will instinctly know that this is suffering-suffering-suffering. These are not just words or some bare ideas - this is my actual experience. And that's why, for example, right now at the present moment, I feel it easy to keep 8 precepts for, lets say, 2-3 months continuously. Five years ago I would be 100% sure that this is just an impossibility. But as it turned out - The Blessed One was right - once again..
Ow, and one more thing - if you are going to find a girlfriend, then there might be a problem for you to practise "fading away of lust" simply because your girl won't understand it ,) So the only options here are: 1) find a Dhamma-practising girl, or at least a wise one (hard to find, indeed) 2) drop this idea to find a girl