I have to say...I worry less about what I am "Supposed" to do and more about what I want to do.
If they can't handle who I am then they aren't for me
it's ok
but...why waste my time trying to do the right things that the books say to do when it might go against who I really am? I meean, sooner or later they get the real you
so I say if you feel like emailing, email. If you feel like calling, call. If you don't then don't but don't determine your actions based on what a book tells you to do
