Are you tied in to the mortgage for two years then? Obviously, you could just stop paying the mortgage and wait for the mortgage company to repossess but any equity you put in will be lost and you'll have a bad credit rating afterwards.
As much as moving out would be great, unless you have loads of money, can you afford a mortgage payment and a rent? And also, how would you decide who stayed and who went.
I'm in a similar domestic situation and if we ever split up, I'd be really p*ss*d off with the idea of him staying in the house (especially if he bought other women back) while I moved out but was still paying the mortgage. And I'm sure he'd feel the same if i was the one staying in the house.
As to how to move on, depends on how you feel about him now: If you're pining for him, having a fling probably isn't going to do you any good. But if you're happy, then maybe you could go speed dating (as mentioned in another post today) and see what you find.
As to making friends, maybe you could join a sport club? Netball, or a step class. And maybe a gym too; you might not actually meet any body that way but you can tone yourself up and feel even better about yourself. And it occupies time - I moved to London and I didn't know anybody so I joined a gym and whilst it wasn't great for meeting people, I got so healthy (because I had so much time on my hands!). the fittest I've ever been
There are also websites that people post something along the lines of friends "personals" so maybe you could google that.
Also, what are your work colleagues like? Any fun? If so, maybe organise a night out with some of them.