Board Thread:Arrow discussions/@comment-142.105.145.69-20150628204617/@comment-5635877-20150703175327

The thing is Slade infatuated with Shado due to the Mirakuru, before he was injected he showed little feeling towards her. The Mirakuru twisted his mind and left him unbalanced and paranoid towards the only person he could blame, Oliver.

If you watch The Return, by the end Slade seems far less angry with Oliver. While I don't believe Slade and Oliver will ever reconcile to where they once were they can still be allies at different points, Slade is a mercenary and will work or anyone who pays.... even a millionaire playboy from Starling City.