Infidelity and Forgiveness guidance

My husband cheated on me after 3 years of marriage. I've decided to stay for all the other things he is and does. Buddhism has helped in all other facets in my life. What would the Buddha advise me to do, what tools would he suggest in overcoming the betrayal of trust, the lying and find my way back to a happy partnership with someone I believe deserves the forgiveness. I no longer want to speak to him in a way which I feel that is punishing for his transgression. Please help.