Great read, goes through forgiveness and why it is often misunderstood.
It would seem that the anger is rooted in two things: first, that the call to forgive implies some dishonoring or diminishing of the pain or injustice someone has experienced, and second, that it seems to imply that there is a requirement to stay in or resume relationships that are poisonous or dysfunctional. But forgiveness need not imply either of these.