Fraud dating sites
Dating services run mail and chat so you can get to know people in a safer and [monitored/controlled] way. Use their platform and the added security it gives.If and when you do decide to share an e-mail address think about creating a separate and anonymous email address.
Don't include your surname or any other identifying information such as your place of work either in your profile or when you first make contact.
Stop all contact immediately and report the matter to the dating site.