Yay. Now we know what you do.
You're missing the point though... if you never did that with your BF, if in fact you'd never done anything sexual with your BF before that, then sent him a sext out of the blue, he would almost certainly be going "WTF?! Who is this?"
I'm different too - I sext with my wife all the time. It's fun - but we have a very active sex life. Does not apply to the OP's situation.