Is he still interested?

I think his interest is still there, however it has dwindled quite a lot. He obviously lost a lot of respect for you when you were doing 2 blokes at once. Men don't usually look at girls like you as wife/girlfriend material. He has clearly put you into the cateory of 'meantime girlfriend' while he looks for someone permanent. I think it will be very difficult to save the relationship, but if he really and truly loves you, there might be a chance.