Most Helpful Guy
Cut ties just straight up copy and paste this if you need to or edit as you see fit.
"It has been great getting to know you and I have enjoyed our time together. However, I am not comfortable committing to a relationship and getting married to you, when we haven't even met for our first date yet. Well I appreciate the thought it's far to soon to be saying you love me let alone talk about marriage. I think it is time we see other people."
Dont be friends cut contact there is no easy way and it never gets easier your breaking someones heart. Your worried about her being psychotic when your only talking online with each other. How are you going to feel when you meet up or she knows where you live? Gotta man up and just rip the bandaid off man its a hell of a lot worse to do it slowly.