For myself, even eating one meal of something non keto, could ruin everything.
No non keto cheats.
Then again, remember, I’m a dirty keto guy who eats plenty of sweets,
(Sucralose) and even bread, almost daily. No reason to cheat on anything. I enjoy the heck out of my keto WOE 
Oh wow, I am so sorry to hear about the loss of your father. That’s so upsetting.
Did I lose weight - yes, however, it was always a white knuckle ride for me. That is why it never worked long term. I love keto eating. All the rich, delicious foods we “couldn’t” have before (or only in tiny quantities), are now okay.