Yes, it surely takes time and a really hard look at how it really was.
We can look at only the good part and the part that "could have been". This is, of course, not realistic.
When you think of him do you think of the time he attacked you (verbally) because you had texted his Father (on an unrelated matter). Or the time you gave him $30.00 to pick up some things from the store, including beer for him and you didn't get your items or your $30.00 back? Probably not.
That's one thing that can help you. Making a list of all the hurtful, odd, things that happened. Then when you find yourself ruminating about his "potential", refer to it, 10 times a day if needed. The mind can get stuck in the "could have been" and that's not actually what happened. Reminding yourself can help you move forward, to remember why you are where you are (not with him).
He is a grown man whose parents took away his phone and wallet, is this someone you would have for a partner?
Always remember that even if he manages to get sober, it can takes years of recovery before he would be relationship material. He has probably been living as an addict for some time, recovery includes straightening all that out, not just putting the drug down.
He is either still living the drug life or he is pursuing recovery, either way, these are probably not situations you want to be part of (and really can't be anyway).