you seem to pour your whole self in to things. You did with R and the rest of yoru life. I'm not surprised that the anger phase is hitting you big, bad and fierce.
Physical activity helped me a lot. Also realizing that the anger is in fact healthy. You should feel angry. You should be pissed for what's happened. You deserved better. Some anger and righteous indignation are called for. Its part of your psyche taking care of you and helping you heal.
It will pass. Don't supress the feelings. Its part of the process embrace the process just watch what your actions are during this time. Keep living well no matter how mad you're feeling.
and BTW -- YOU definitely deserved better and I'm kinda pissed on your behalfBut that's just a lot of water
Underneath a bridge I burned
And there's no use in backtracking
Around corners I have turned
“Many of us crucify ourselves between two thieves - regret for the past and fear of the future.” -foulton oursler