I'm not going to tell my housemate I want to transfer, I hope you can keep this a secret?
What would motivate you to not tell your housemate about your transfer? I can't believe you said this.
I want to get a new start, away from where I am.
If you want a fresh start that is a good thing, but you shouldn't just leave your housemate without telling them.  If you explain your situation to your housemate they might understand where your coming from.  If they don't understand or get upset, than there is nothing more you can do and you should move on.
What if they get mad and try to stop me?
You should let people know. If they get mad then it is on them. Nothing should really be in the way of being honest with people this way.