Secrets you share to others but you don't share to your partner  

Secrets you want to share to us but you don't want to share with your partner, do you have any? I think there are also secrets that we don't want to share with our partners, not because we are afraid so, but we just feel like not wanting to...

Do you guys have any? Something that's more than being unfaithful, which is very common for a relationship secret... maybe something like rape experience... or maybe your being an alien disguised like a human being.