Originally Posted by
Soulful 
Did I really waste all this time? Why did I completely close my eyes and ignored the signs? What happened to me?
I have so many questions and I thought I would find more peace, but instead I can't stop interrogating myself about this mess. How do I begin to make sense of all of this chaos, so I can find some peace, get closure and move forward with my life?
I think it's great that you are focusing on yourself somewhat. Doesn't hurt to ask yourself those questions. Interrogation though is maybe a bit harsh? No reason to be hard on yourself really, you did the best you could.
As for wasted time. Aside from his addiction you must have seen some good qualities in him. As these things are progressive I assume it just got slowly and possibly progressively worse (you've probably read the boiling frog analogy).
Once you fully woke up to where he/you were at, you acted. That's a good thing and you should be proud of yourself for acting, that takes courage, in my opinion.