Take care of yourself, man. I lived with an ex for the better part of a year out of "necessity"...it was awful.
If she felt it was ok to cheat on you while in a relationship, what will her attitude about cheating be since now you will only be "figuring out if we want to repair things between us or separate?"
Just sending you caution - on her getting out before August, 'where there is a will there's a way, and necessity is the root of all invention.' You'll do it if you feel like you have to. Best to you.