Love scares people. Some of us are better at it and better equipped to give and receive it. Like I said to the person who started this thread, I won't even give him the benefit of the whole recovery issue to be an excuse.
Meaning, it may have had nothing to do with where he is with recovery, he just is a person who is ill suited for the type of love you want and have to give.
Maybe he had someone new, who knows. Remind yourself of that when the 'poor guy alone in his room' type of thinking starts. I say this because I do the same thing. I start rationalizing d*ckish behavior just to make sense out of it. You may never know. Just that it feels crummy
Time heals. And I sense you are still very sad over this man but when you hit the anger stage.. that is when you will get some clarity.