Answer:
You have to decide whether or not you can forgive him. If not, you won't ever get over it. Is the relationship worth it to you? Weigh the pros and cons and then decide. If you cared for him when he was ill, even though he cheated on you, you must have feelings for him. Has he shown remorse for what he did? Talk to him and tell him how you are feeling. Perhaps the two of you can work things out.