I’ve been moved to write a reply after a bad experience with a lodger myself, so take it for what it’s worth. I think you should not disregard your feeling of alarm and fear he may just turn up and make a scene. It may be your intuition telling you something. Stick to your boundaries and if you feel he repeatedly disrespects them or you feel manipulated, consider finding a new lodger. Remember lodgers don’t have the same rights as tenants, so you can ask him to leave at any time with reasonable notice, and the notice can be verbal. https://www.rocketlawyer.com/gb/en/quick-guides/how-to-evict-a-lodger