I could be wrong, but I doubt that anyone around you cares what happened five years ago, particularly if your boss was known to be difficult. It sticks out in your memory of course, because you were involved.
It sounds like you are understandably touchy about being liked, and I hope that is coloring your judgment - because the best way for things to work out would for it to all go away on its own.
If it doesn't, you will be able to find ways to handle it. We are here for you.
By the way, Skinny Yorkie Mommies misses you!