arsh, we all go through this journey in our own way. You will feel anger at some point. It is one of the stages we LBSs go through. But I wouldn't worry that you are not there yet.
Remember, kill him with kindness. When he is unfriendy, you remain friendly. When he is angry you remain calm. When he responds with derision you respond with softness. Likely he is wanting you to snap back, be angry, and return his derision. Then in his mind he can be "we aren't getting along, this is the right decision!" He is trying to create what he wants. Don't fall for it.
As far as pain, yes the pain lasts a long time. Even now I still have moments of pain from things that happened in January. Things she said in February. The fact that she was willing to throw away our family for a selfish dream of being on her own. And we are now 3 months into R.
There is nothing fun about DBing. No one ever woke up in the morning during their sitch and thought "Yeay! I get to work on detachment today!" Even the GAL feels more like work than fun. Especially when your sitch is weighing heavy on your heart. I would be out with my friends and my mind would be back in the middle of my sitch.
So anger will come. But the pain will linger. No matter what happens you'll feel pangs of regret over things well into the future.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018