I felt so unloved and rejected and really just missed him. But I cannot look at it like that given the context of his addiction.
Well...sure, you miss him. That's normal when a relationship ends. But the truth of the matter is things were never going to advance with him given his issues. He would, in all probability, spiral out of control. And then where would you be?
So you've got your freedom. And there's a couple of ways you can look at this. The first way is to do some self evaluation and see if there's anything to be learned from this...and then move on. The second way is to remain stuck and not really let go of him. My hope is you'll choose the first way, and allow your heart and your soul to mend a little bit each day.
Be safe.