F40 cheated right before I got married

I guess this is as good a place as any to make this confession. Been married 13 years. Very happy. However leading up to our wedding I was getting nervous. Just regular nerves but still was feeling a lot of pressure. So I was going out after work a lot with coworkers getting drinks. With about 3 months to go to the wedding I ended up at a bar with some coworkers. Everyone left except me and a male coworker who I was flirty with at the office. One thing led to another and I ended up fucking him in the back of his truck. This led to about 3 months of nonstop sex with my coworker which ended right before the wedding. I never told any this before but I wanted to get it off my chest.