I understand not being quite as close, but they were such good friends. Good enough that Sasha had the right and duty to let Willow know she thinks her dalliance with Drew is wrong. BUT once Willow says she knows what she's doing, to drop their friendship isn't very friendly. I agree with Sasha, Drew is a cad and Willow is going to suffer for falling under his spell.
And Sasha should want to be there for Willow when it does. But with her hard stance even if she wants to help Willow there will justifiably be no trust there.
Karen L.