its not necessary for you to forgive ... they wronged you and its on them to face the consequences of their faith &/or karma.
it absolutely understandable how you harboring ill towards them is what seems justified and passes for due vengance on your part but ot only serves to prolong the lingering harm from what their actions have already done to you. love & hate are emotions that equally consumption your energies. apathy is the void that allows you to be able to lessing some of the toll the lingers from the harm their actions left you with