I'm mad at my dad because he relapsed so I'm ignoring him
Why is that?
My dad is an ass.
Maybe if you help him and spend time with him you will help his chances of getting better. Its not nice to ignore people like that.
Maybe I'm mad because I'm envious of his addiction.
Are you jealous of the attention he gives to his addiction? That's completely understandable, and you should talk to your dad about how his addiction makes you feel. It can help someone recover if they know how people they love are hurt by their actions.