Remember, forgiveness is a gift that you give yourself. You've said that you love her...then do it. If your love is genuine and deep, and unconditional...then you can do it. Remember compassion. In a loving relationship you need to promote compassion, which is the only reliable prevention of resentment, anger, and abuse.
"Always go straight forward, and if you meet the devil, cut him in two and go between the pieces." - William Sturgis, clipper ship captain, 1830's.