As an addict I know that side well. I have never been on the other side.
The relationship between an addict and his drug is complex yet simple. He wants it, will do or say anything to get it and will resent anyone or anything that stands or tries to stand in between. He will hide, lie, cheat, steal and manipulate others to get it and cover up the fact that addiction exists even to himself.
What you were told may be true for him at the moment but may be a reaction to something he didn't like. An addict will try to manipulate his environment by saying whatever seems to accomplish the objective - getting the drug.
I do believe that emotions being what they are that a person can love another and yet the frustrations and consequences of the relationship can lead to some pretty strong negative emotions on both sides.