I'm not going to mention to my date about a previous hookup
Why are not telling your date about a previous hookup?
I don't want to face the consequences and I fear for my safety.
Discussing things that happened in the past can be difficult but you should be honest to your partner about your past. Especially if it can affect them in the future.
Nobody knows about it and I don't want her to either.
But your previous hookup sounds serious like you're in trouble. Is she going to be okay?