I found out about his cheating (with a married co-worker who is still with her husband) almost 12 months after the relationship had ended, even though we still shared the same house. All I felt was shock. He hid it so well. He played the perfect guy for years. Shocked that the person I thought was my best friend and love of my life was a cheater, a liar, a user and a home wrecker.
That was the closure I needed. I was very scared to learn that he had been so deceptive. I was done with him from that point.