I am of the philosophy that you really let go and when the "friends" thing comes up...."Oh yea, sure, we can be friends. We probably make better friends than we do lovers, and I now realize that you were right, I will always love you, but I am not IN love with you either".. and then I would in reality, be a terrible friend. One that doesn't answer all calls, one that treats him like he treats you. etc. etc..
wouldn't that just give the impression that you are not over the WS?
the problem with me is that i'm a 'digger' and i reveal my emotions. i'd never just end it with "sorry, i'm busy." i'm more of the "sorry, i'm busy. why don't you go ask mommy and daddy for help? they've got nothing to do but wait on you hand and foot anyway."