I have been living with my partner since 2013. But after the birth of our son in 2014 things became unstuck. We were living together but I was making plans to move out, even viewed properties etc and therefore began claiming CTC and WTC to ensure that I could afford to go it alone. Eventually we worked it out but it has been on and off for years.
In addition to this, I was in a lot of debt, had lost my job and knew that (selfishly) I needed the tax credits to keep my head above water. My partner has no idea that I was claiming and if he finds this out he will leave me for sure.