The Rejected Chubby Wife, Now His Brother's Goddess

RIEKA
She was a naive,chubby,wolfless werewolf,maltreated by her mate to the point where she loses her sanity and womb,her crime was being chubby and less attractive than her peers.
GABRIEL
He was a handsome,strong willed womanizer,who happens to a hybrid ALPHA prince,the person he loves the most is his kid brother RALPH.
He has searched high and low for a mate he could never find.
What will happen when he finds out that his beloved brother's ex wife,happens to be his long awaited mate,who was maltreated and is currently mentally unstable?
Will he forgive his brother for hurting his mate?or will blood flow?