How ironic, true? They both went from being the worst enemies to being the "best friends".
But no one takes it out of my head that Hank is still a vile rat.
On the other hand, I understand the Antonio's suffering. He ended up heartbroken because of his ex-wife, his sister was gone to Puerto Rico, his relationship with Sylvie didn't work and his partner and best friend was murdered by a cruel and dangerous Colombian drug trafficker. He must have been so sad and lonely that he then started using drugs after a shoulder injury.