We all have made mistakes, and will continue to make them, after all we are only human. It’s a constant struggle to control our desires and our tongues, so don’t continually beat someone up (verbally) with “what they did”, their past failures or indiscretions. Soooooooo, if you haven’t already, sit down together, talk about it, clear the air and If you have truly forgiven them, allow them and yourself to heal. Move forward and leave the past in the past! Let it go, because you can’t very well move forward, while looking backwards.
God gives each and everyone one of us a daily measure of forgiveness (grace and mercy), because he knows that we live in sinful bodies, in a world of full of sin. Who are you not to extend the same love and mercy to others. “Do unto others”!