It’s the mind's way of protecting itself and you. Some things are better forgotten. Something in you learned from the experience - even if it’s just to make you more aware of dangerous or hurtful situations. In other words even if you don’t remember a part of you does and will hopefully make sure that it never happens again.

I’ve been there with the lost time and memories. Believe me, it’s best to leave things as they are and get on with the business of living the rest of your life on your own terms.