Your 'partner' will barely exist to the RAF. You'll get no allowances, she won't automatically be included in things like social activities (although unofficially probably will be), you can't get a military house, she gets no right if you die in service. Moving around the country to some fairly remote places, without a proper support structure, is a crappy thing to do to someone you love. Finding rented accommodation, then work, then a new social life - that is all really tiring. Then, to leave her somewhere like that, far from friends and family, while you go off on detachment / deployment is really rubbish. Getting drunk 50% of the nights you are in Cyprus won't be funny to an unemployed girl on her own in a rented flat in Lossiemouth Village.
All of that is post-training. Phase 1 & Phase 2 training you're expected to 'live in'.