People have gotten over an addiction without professional help, sure. But what about any of the events of the last six months is giving you the impression he has any desire to quit taking drugs?
When we are in relationships with addicts, it is very easy to feel unloved, because the addict is primarily in a relationship with their drug of choice. But feelings are not facts. He addiction has nothing to do with you, and his addiction is driving the bus here.
Regardless of what he does or doesn't do, I do think you have some serious questions to ask yourself about why accepting such disrespectful treatment from someone is even an option for you. Instead of indulging in fantasies about what his life is like, it might be time to get serious about your own relationship with yourself. Addicts who aren't interested in recovery will always let you down, but when you interpret that as a reflection on your own self-worth, it's a big red flag that you have some work to do.
How were you doing during your stretch of no contact?