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| Regarding the lack of regard for security, can you lock the internal doors to the flat (i.e. kitchen, bathroom, your bedroom)? Lock them on the way out to work and take the keys with you. Until he learns to lock the external access to the apartment, the internal doors stay locked when you're not around. | |
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Yes to the locks. Except to any spaces, such as bathroom, which are included in what he is allowed to use.
Move all your possessions out of any shared spaces and into your private rooms which you lock from the inside when you are at home, and lock from the outside when you leave the flat. It's very effective.
However, I wouldn't count on his learning anything such that you will want to continue sharing with him.
Keep your possessions safe while you give him formal notice in the correct way.
You could also just ask him to leave. You might find he's not happy either, and will just agree to go.