I cheated on my husband.

About two years ago I cheated on my husband. I havent told him. Were separated now, nearly 7 months. Our marriage has been failing for 6 years and wasnt that great before that. Our marriage is over and I feel immense guilt and sadness over cheating and complete disgust with myself for breaking vows to him and disrespect to myself, my values and ethics. This cheating has caused me to feel like a fraud in my current life. I dont take compliments, I believe I will be punished the rest of my life for my mistakes, and rightly so. My question, if anyone has felt this way, how have you forgiven yourself? Did you tell your spouse? I dont want to hurt him just to make myself feel better, I dont want to hurt him anymore, but I think about it everyday and it is truly effecting my life and I do believe he has a right to know... Im so lost.