Would you tell your crush about your past before someone else ruins your relationship?

If you had a good relationship with your crush, you tell everything to each other. Your honest.
And you found out that she knows a guy who is friends with people who went
with you to the same highschool and they started fake rumors about you back then.

Would you tell your crush?
I mean, let her know about the bad things from highschool,
from your past before she, somehow, or by someone found out first?

It could be a guy who wants to date her and starts telling her stuff that never happened so she stops talking to you, it could be a girl you never dated who wants revenge.
It could be a lot of different things, but I don't want to ruin my relationship.
I don't want to look insecure, or weak, or kill attraction. I just want to let her know
so, when and if the time comes, she doesn't get surprised about stuff that never happened.

I already lost a girl for that kind of stuff once. She believed the rumors instead of me.
I don't want to lose this girl. I really don't. She means the world to me.

Thanks for your time and for reading.
Would you tell your crush about your past before someone else ruins your relationship?
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