Should I tell him?

Well, my bf and I were going through a rough patch so we ended things. I thought we were really over for good, so I slept with a former fwb. I was a wreck and I guess felt like being wreckless so that happened once. Our breakup lasted less than a week. This was a few months ago that this happened but I kinda feel guilty or like I did something wrong even though we were broken up for that short amount of time. I feel like I should tell him to give him the choice if he wants to be with me still after that, since marriage has been brought up.