How do people move forward from such a betrayal?
Time. It just takes time. It's hard not to feel resentment when there is a major betrayal. Resentment for all the time, effort and emotional investment put toward this person and.....POOF. No remorse but instead mean spirited actions.
As was mentioned by KellyF, you deal with all of the emotion. You recognize it, acknowledge it and then......using the compassion that you are practicing.....you forgive and move on.
Forgiveness isn't necessarily for the other person. We are not condoning their actions by forgiving......we are allowing ourselves the freedom and joy to move on and no longer allow those actions to hurt us.
But it takes time.
gentle hugs
ke