[Heartbroke III]

My wife of 31 years admitted an affair that occurred about 20 years ago. We had attended church one Sunday and the sermon moved her to come clean. She has been forthcoming to my questions but somewhat vague in her answers. such as,
How long? How many times did you meet? (It was her boss and he would ask one of the 3 women in the office to accompany him on business trips (a couple of hours at the time) which were justified due to the type of business he was in.. My wife has said he had business to conduct outside the office 1-2 days per week. She said they had sex every time she went out with him. They had sex in our car, our house, his house along country roads and met in Hotels. She said she gave in to him because he flattered her and made her feel special she was never in love with him. She said the may had been together maybe 12 times in a 1 - 11/2 year affair. I'm having trouble believing that it didn't happen more than 12 times. She has said she broke things off with him and has been faithful since. Will I ever know???