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.
Stop all contact immediately and report the matter to the dating site.
Report Unacceptable or Suspicious Behaviour - Nobody should have to put up with offensive, insulting and threatening behaviour online any more than they should or would if talking to someone in a bar or café. Don’t feel bad about cutting a date short if you’re not keen.
Trust your instincts and immediately stop communicating with anyone who makes you feel uncomfortable or apprehensive. You don’t owe the other person anything, no matter how long you’ve been chatting or what’s been suggested. If you’re raped or sexually assaulted on your date, help is available.