Please stay away from her phone, computer, mail etc. as if they are radioactive. Nothing good comes from reading any of that. This is my one biggest regret. Bigger than pursuing, being rude, unreasonable etc. First, you are disrespecting her and her right to privacy. Second, you are just torturing yourself.
Not sure what your situation regarding the couch is, but try to figure out what to do about it. It does not make sense to sleep in the bed when she is out, and on the couch when she is in your bed. I treat my dog the same way she treats you.
Make a decision, and either sleep on the couch because you decided to do so, or sleep in your bed because you decided so. Either way, do it without arguing with your W, even if she goes berserk. If you decide to fight for your bed, just go in lie there and go to sleep. If she starts arguing, screaming etc. Just say this is your bed (implying she can sleep wherever she wants, and you will do so too) and you decided to sleep in it. You do not need any other arguments. Just make sure you do not get into a fight with her. Be like Mahatma Gandhi - nonviolent resistance.
