If you are a Christian, and read the Bible, you know the answer. You are to forgive, in the name of Jesus, though the hurt may still linger, and what they did cannot be erased or even hardly forgotten. But once you forgive them, you give it to the Lord, and let Him handle it. They may never apologize, nor even think they did any wrong; that's between them and God. If they ask you about, then perhaps you may discuss it, but don't make it a huge issue. Merely say I forgive you and move on. Still, that doesn't mean you have to repeat being in their presence or continuing the association, unless you desire to, or by some circumstance, must. (If a person has served me poison on more than one occasion, I may forgive them, and can be politely cordial, but I am not required to go back for more....) This can happen with friends, family, or co-workers: adjust your life accordingly.