backtext
A response, or not, to a text ; often describing broadly or specifically the time before text was returned.
I waited a while to backtext her because I didn’t want to seem too interested.
Backtexting
Derivative of 'backstabbing', the act of being friendly to someone's face while secretly bashing them via text (usually while in their company).
I can't believe it, the whole time she was a guest in my house she was backtexting me to her friends.