Have you ever wanted to forgive someone but just can't?

Listen, I hate using this stream as mental health advice, but there's something I really need y'all to help me with. Remember when I was all angry at AMemerWhoActuallyLovesSchool for making biphobic comments and continue to treat them as a villian even after they apologized? I really want to forgive them, but I just can't bring myself to actually do so. What should I do?