If you are still under the same roof and especially if you are helping him with moving on with his life, it's normal to feel a bit guilty and not have too much space for dating yet.
Space will open up in your mind as soon as he is out and you see him way less.
The dynamics will shift as soon as he is out of your place.
Once he is gone, remove ALL TRACES of his presence in your personal space.
This will help you A LOT with getting a fresh start and resetting your mind.