Thank you for the additional information.
now, re the lodgers email, you. Ay be able to commence a claim against him for defamation. Defamatory statements in essence includes where something is said to a third party, which is untrue and has the effect of damaging ones reputation. In your case, it has had an impact on your work.
you would first be required to write a letter to him advising of the effect of his statement, that it is untrue and that if he continues or does not retract you will commence a civil action against him.
because of the magnitude of what has been said I do not recommend that you write this letter yourself but rather instruct a Solicitor to write this letter. This will give the letter so much more weight.
I hope I was able to put things into perspective for you.
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All the best