H cheated 3 years ago, I have no feelings, I catch him in lies recently. I feel like I'm going crazy, leave?

My Husband cheated 3 years ago. I've stayed to see if things might change, but no. I have no love in my heart. I still with lies here and there, that make me remember when he was lying while he was "caught in the moment". I truly want love in my Heart, they say that can make a very happy/healthy life. I sometimes feel I'm going crazy when I have to deal with this stuff. I need peace and harmony in my life for myself and my 8 year old daughter...Thanks for looking.