Thats the sad thing about an addiction. It robs the person of every thing good and replaces it with things like, selfishness, paranoia, need to control(manipulate) others and so on.
We have no place in their addiction. It's all about them and it always will be till they decide to get help.
Don't play into the self destructive idea that you (or anyone) will be able to "cure" them of their disease, that if you "could only get them to understand your feelings."
It doesn't happen.
Get that in your head. Then, find something for you. Something that you can look forward to so you don't have to feel down and out.