I am so happy that you checked in . In the FWIW category - my Dad had an affair (typical mid life crisis) and my parents recovered from it and are actually the better for it. It not only opened up closed lines of communication but a kind of respect of my Dad for my Mom that had not been there. Also, my Mom would say that she learned not to take my Dad for granted. Mind you, my parents always had an active sex life and my Mom said the only time it ever decreased was the couple of months my Dad was having this affair. I don't know what he was looking for, escape maybe? but my point is that they survived.
Mom and Dad were siamese twins for a while and even after Mom got comfortable with some separateness Dad followed her around like a lost puppy. I would say that the entire healing process took about two years. I didn't live with them during that time - I was in college.
Gel, healing is possible. My answer is not "Oh just jump Mr. Gel." I just want to make sure that you settle for nothing less than the marriage of your dreams. Mr. Gel owes it to you.