PIP cheat

Hi, very long story, but in short I helped a young person out who had a number of personal /mental health / drug issues, I invited them into my home and
my family, after nearly 12 months I could no longer support them ( too volatile) and had to ask them to back off and leave my family alone. During the 12 months I had shared a lot of details about my disability (MS) and that I received Pip and had a mobility car, I have now received a letter from PIP asking me to complete another application form, when I telephoned them to ask why I had the form they said they couldn’t tell me. I have put 2&2 together and realised this ex friend has reported me to pip, they knew I had difficulty walking but not all the time, I have good and bad days. I attended the 1st PIP assessment in a wheelchair as it was a bad day. I’m really worried that the DWP have evidence of me walking ( with a stick) and will remove my benefit. I’m having sleepless nights now worrying about it, I’m NOT a cheat but I’m sure they will have twisted things to make me look bad.