I know what you mean. OW in my situation is a very messed up woman. Many affairs, many messes in her own life even before she met my H. H was very addicted to her, she fed him what he needed at the time. He was sleeping with his cell phone, forsaking everything to see her when he could, pursued her like crazy when she tried to break it off in September (drove by her house, called her constantly, etc). All that energy. Amazingly, H saw the light at broke it off with her in December, now stating she is crazy. But....he still wants a D.
I hope your H will see differently soon. Its very hard to watch them be so addicted....