I'm going to tell a girl she should probably find a new home
Why would you ask her to find a new home?
I need to gain my freedom some way or another. It'd better if she went away.
It's rude to kick your roommate out of house without any good reason. Imagine how she will be able to find another place so urgently.
I know it sounds cruel. But I need my space.
Please make sure they have some place to go before you kick them out. If you are feeling really stressed out you can talk with a therapist while you wait for that space.