Living in each others pockets is always bad news if its the same old routine like you have.
What to do... Firstly do something different other than watch TV blah blah like you said. THat would be boring anyway regardless. I appreciate its hard to fit around work.
You say she has no mates at all ? IS that 100% true, dosnt she hae any work mates atall that she can go out with on the razz once or twice a week??
If you are missing out on banging random women, playing PS2 and smoking dope with your mates and you consider that to be more important that the lady you have loved for 2+ years then good for you. I dunno how old you are but if you are early 20s chances are you aint going to spend the rest of your life with her are you. You probably know the answer to your questions already. You do what you are going to do i think the 2 week trial appart is harsh for her. You are going to live it up or try to your best ability and go out of your way to have fun no matter what
I think the minute you thought about it all you doomed the whole relationship