"Hey, ____. Quit being an ass. I deserve to be treated better. Either straighten up or am out of here." Then follow through if he doesn't straighten up.
Long time boyfriend has been doing things that I feel are being mean to me. I would like to tell him I don't like him right now, or maybe never,but don't know how. Probably should have broke up long ago?
You don't have to sugar coat it .. Tell him he is being 'mean' or is 'over reacting' or is simply being a dick. Tell him how it pisses you off and that's not how he should treat someone he supposedly loves.