Provo,
The images are most likely blured due to your hand shaking - 'camera shake'.
Some cameras have Image Stabilisation which helps this. At night however, camera shake is likely to occur. This is why people recommend a tripod a night.
If you look at your images, they may say the exposure time (right click on the file and goto properties). It's probably in the region of 0.5 - 2 seconds. This means that your hand cannot move for 2 seconds in order not to create blur.
When in NY, you could rely on natural light to get some nice night shots. With your fiance in the image however, you will probably find that you cannot see their face as they are in the dark. You therefore need to light them - with a flash. You could position them under a street light which may look pretty cool as it is in keeping with the ambient light, but again there may be blur.
Try throwing your camera into manual mode. Go out at night and set a long exposure time (2 seconds or so). See what your fiance looks like. Now turn on your flash. If you can look into your manual on how to turn-down the flash exposure (may be called something like flash exposure compensation) turn this down. Take a shot. Hopefully you will now see your fiance. If the effect is too much, increase the number of your aperture setting (increasing the number decreases the aperture). The effect of the flash should be reduced.
Hopefully you will see that the background (the night life) is still in keeping with the ambient light. This is because you had a long exposure time. This will still be blured, but because you used flash, anything hit by the light from your flash (hopefully just you fiance) should be sharp.
If the night life is too dark, increase the exposure time.
Hope this helps.
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