I had a turbulent relationship with a guy who was seeing others behind my back.. lots of emotional abuse came with it. If I confronted him on his behaviour, he would 'gaslight' me at every opportunity. Basically, it was a dizzying ride of 'idealise, Devalue, then discard'. He eventually went with someone else after the final confrontation when I found him on a dating site. He told me about a close relative renting out a house, and was quite boastful in how they evaded paying Landlord tax to HMRC. At the end of the relationship, I dobbed him into HMRC with all the information I had. The person at the other side of the phone sounded very interested, and told me they are dodging £1,000 a year at least in tax. Was I unreasonable to report this?