I'm going to try to take over a new lease for my apartment without my current roommate
Why would you do that to your roommate?
Currently we share a 1 bedroom, I want my own space.
It's mean to go behind someone's back in regards to living conditions. You should tell your roommate you are leaving.
Don't you think that's hypocritical?
No I don't but you cant leave them hanging if they can't afford the rent or need to find a new place to live. I mean how would you feel if they did the same thing back to you?