I read 3 books, etc. etc. on the subject, trying to do this for myself. The best advice from my readings and listening to preachers, is you know you've forgiven when you pray for the other person to have the wonderful things life has to offer that you would want for yourself. Try it. You'll know if you can forgive the other person at this time. I am just after weeks of this, able to pray for all those blessings to go his way and wish him more happiness, contentment, etc. than he had with me. If you can't do this, dive back into healing yourself and work on the bigger issue--forgiving yourself. Yes sirree! It's a huge key to forgiving the other person.