My friend and I got into an argument. We both exchanged words and we are not talking. What should I do now: wait, tell her that I forgive her, or apologize?
If the initial anger has quieted, then I recommend the humble approach by gently offering an apology. Often, a sincere offer of apology helps the other to forgive. From a philosophical perspective, one can forgive unconditionally without an apology, but the apology does help.
For additional information, see Learning to Forgive Others.