Thanks for all the replies guys..
And to answer the biggest ones..
No, I don't believe she's out with anyone else or would even jump straight into bed with another bloke.. (thats what they all think I here you say).. but, I just know shes not that type of bird. Yourll have to take my word for that.
Yes, Ive basically funded her through uni.. Long story: I didnt have much of a choice but to move out on my own 2 years ago.. we were both happy and sensible and decided it would be a good idea to do it together. The most she could and still can afford to give in contribution to me is £300pm. I pay for everything else via full time job. I was happy doing it and still am. It was a long term thought as after her 3 year course we'll be better off so doing this for the short term really isnt any issue.