I cheated on my husband 3 times and the guilt is killing me?

Your confession will only hurt your husband, so if you want to hurt him then tell him, however if you don't want to hurt him, then keep it to yourself. You are doomed to live with your shame. Telling him will not relieve it but just spread it around. Keep going to counseling until you develop a plan for how to live with it, and the alternate plan for what you want to do if evidence did come to light (which is highly unlikely unless either of you are public figures). Then go live your best life. The past is over.