Diet and exercise along with running are all in good order. But I was wondering if I used creatine would it just add the bulkness back onto my body? Or is this a bad idea, just use one or the other?

you apparently don't understand how creatine works.

the only reason not to use creatine on a cutting cycle is if you start taking it, you'll retain some extra water, which will affect your weight by a few pounds. it can be discouraging, because you really are losing fat, but the net weight loss is 0 because you hold a few extra pounds of water.

after 3 weeks, you hit creatine saturation, and thus water saturation, so then you finall start seeing weight loss on the scale.

Should you cycle it on and off...lets say 180 days on and 30 off then on again.