Are you getting professional support for your depression, if so I think you should talk to your mental health team about this one. Obviously your life has been turned upside down by your illness and you need some answers.

I think you need to forgive yourself for what has happened and start to move on. You don't need to blame yourself, just accept that for whatever reason you did something out of character and potentially damaging to other people. If you have the opportunity to apologise, then by all means do so, but if the other parties don't want to accept an apology that is their choice and you must respect that.

Your use of language like dishonest, deception, fraudulent is very harsh and suggestive of a criminal act, which I don't think you have in fact committed as you weren't trying to secure financial gain or other services. British law recognises that judgement can be severely impaired by mental state, to establish legal culpabilty there needs to be a "guilty act" and a "guilty mind", so if suffering from paranoid delusions although an act might be wrong, there is an element of diminished responsibility and no "guilty mind".