<human>: Long time lurker, first time throwaway:

Girl and I had been dating for quite a while and decided to get an apartment together. Signed a one year lease in Pennsylvania, only two months in and things didn't end up working out. She's decided to move out. Problem is, we're both on the lease, no cosigners. 

It's a two bedroom, and I've been perfectly willing to continue living separately in the same apartment, staying out of each others way. Truth is that that would probably drive me nuts. However, the alternative is living with someone else, which I very much do not want to do. Before this I've always lived alone, I'm a very solitary person, I enjoy my own company very much, and it feels very awkward for someone to be in my space. I was able to make this step to live with someone else, because we had been so close, but considering living with a stranger really puts me on edge.

Thankfully, she's civil and responsible enough to continue paying the rent until someone is found to sublet the apartment, even though she has moved out all of her things. I say thankfully as it would be very difficult for me to afford this apartment by myself, though I could, I would just be persistently broke. So the dilemma I face is this:

I don't want to live with someone else, but I'm not childish enough to turn away subletters. I agreed to this year long lease with the understanding that I would be living with her, and while I know that she feels she can't live here anymore, it is her choice to move out and put me in this position of living with some random person. For all I know, we might find someone great that I'd love to live with, but what I'm wondering is how long can I reasonably deny subletters that make me uncomfortable before it becomes out of my hands? If she went to the landlord and said "ten people were interested in living there and have acceptable levels of income, but he is refusing them just to hurt my wallet" could they lawfully intervene?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Pennsylvania, lease with ex-girlfriend for ten more months. She's leaving, still paying rent until sublet found. I'm socially awkward and afraid of getting stuck with terrible roommate. What now?