I deeply admire the honesty you are displaying by acknowledging this part of your past. Here is the concern I have if you keep it secret. It means that you will have to carry the burden of this for your entire relationship. Beginning a relationship with a secret is not typically the best way because most people will then doubt who their partner fell in love with — the false image being presented or the authentic one underneath.
On the other hand the “stalker” was created out of a deficiency — and now that that has been fixed with a genuine relationship the need to pretend has dropped away. The question becomes if the secret you’re carrying becomes a drain for you to hide, of if you past is seen as something transcended as you are now more whole. You might not be dating if the “stalker” hadn’t initiated the contact, so in some ways it served the very purpose it was created for.
The decision rests on if you see your past as shameful, needing to be hidden, or something that grew out of a pain that you have worked to heal through your relationship.
Wishing you patience and peace,
Proof Positive Blog @ PsychCentral