Although we are not counselors, we do hear a great deal about real cases of infidelity everyday, and based on those cases, we would have to say, yes they can be fixed. Obviously, the first step is to get the truth. Your spouse, for many reasons, will lie to you, often they try and lie even after proof is shown to them. Once you get proof, you need to decide if you want to keep the relationship alive and for the right reasons. At this point we would advise that you get some professional help either from your church or community services or from a marriage counselor to help you to determine how to move forward.