Answer: Letting go of a grudge towards somebody is not the same as becoming best friends with them or letting them fully back into your life. You don’t have to set things straight; make them feel like they were right and you were wrong. You observe the sensation you feel when you are thinking about this person, you feel the energy in your body. It is this sensation you are surrendering to, and that feeling you’re letting go of. It happens on a very physical, tactile level within your body through investigating the sensation. How all the situation goes is not the concern - the concern is the sensation. The grudge is in the energy.
Unless you are ready to let go on the inside, no matter which actions you take on the outside, they’re simply not going to bring about any kind of resolution. If you are able to release it on the inside, it matters very little whether or not you experience an external effect.