His infidility has hurt you badly and the pain like all loses is going to take time to heal. I feel for you especically since I am a woman and have been hurt before in matters of the heart. Get it all out, tell him exactly how you feel, you are deffinately in pain and understandidly so. When someone you love lies and cheats on you with another it can be devastating. After you tell him, but good, try to stay away from him and his as much as you can. It will be difficult to distance yourself but it will give you time to rehash and recycle the entire relationship. You're a good woman and it is going to take time to heal and trust another man in your life. Take this time to write about this whole thing in a journal, believe me it will help. His loss, and oh yes he will regret how he has treated you, what goes around comes around. Be encouraged my friend.