Love is give and take. Sounds like you are giving and he is taking.
Why do you allow him to be so inconsiderate? Take charge! You are woman! Stand by your word and stand up for yourself.
I would do the work myself (but then I am into DIY).
1. Add a lock to the door.
2. Move his crap out. If he doesn't like it - he will find a place AND IT WON'T BE PUTTING IT BACK IN YOUR ROOM!
3. Find a way to get the room fixed up. Can you enlist the help of a friend?
4. While you are doing this, I would go on household duty strike. No cooking, no laundry, other than my own.
Even my sweet man had to learn some of these lessons the hard way. He is as tame as a pussycat now because he KNOWS that I can let the B**** out any time.