Sorry to read of your struggles.

Not having a sense of closure, seems unfair, of him to you.
He's abandoned you, and your dreams. Just saying, you should never trust an addict, seems nonsensical, in a break up sense.
At some point, anger at him, may help as you move past him. It's hard creating new social circles, just follow what you enjoy, and over time, friendships, networks of acquaintances will happen. You need supportive people around you.
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