Now...no calling him. No contacting him, no initiating relationship talks... And no asking him questions--this will force him to give answers you don't want to hear. Often those answers aren't real...but he figures it's the nly way to get through to you.
Detaching and Letting Go take time. Give yourself that.
And be grateful that he chose a low-class druggie--we all hear the you don't know her comment. When it comes to affairs...the lower the better.
You aren't back to square one. This is all part of the process of your growth. We all do this in the beginning. And we eventually find ourselves and feel strong instead of desperate.