I'm sorry for your pain salinity but it does seem like this breakup might be for the best as far as you're concerned?
I can't really answer any of your questions because there's no such thing as a typical addict response or a typical addict one...but it does sound to me like your ex is immature, like you said, & probably a little cowardly with it... and that pretty much explains his actions on that night and since.
Sounds to me that, no matter how much you feel you love him, you deserve someone more worthy of that love?
D