@KWaiting,
Two years ago, he was drinking, he went to a strip club and he kissed a stripper.
If all your fiance or future husband does is kiss other women, you don't have a problem. Particularly that he feels guilty enough to confess it to you and if it as rare an occurrence as it seems to be.
Your more likely problem, frankly, is that you will fracture the affinity between the two of you through this (what I think is an) unwarranted level of jealousy.
You said that "he wasn't safe about drinking while being out". It's unclear what you mean here. If he was driving while impaired, that would be a valid concern and reason for anger. But I'm not sure that was what you meant.