- Red flag
- Not (past is the past)
Most Helpful Girl
Revenge cheating is undignified and counterproductive. However, being cheated on is an extremely painful and upsetting thing to experience. I'm not sure that I would judge someone based on something they did while they were dealing with something so difficult (unless they committed a violent crime, which is ALWAYS a red flag). In addition to that, this was three years ago, and she might have changed in that amount of time.
If she's a wonderful girlfriend to you, cares about you, and treats you with respect, then I don't think I would be too concerned about what she did three years after being cheated on. Unless, again, it was a violent crime or something else very extreme. And revenge cheating, while a bit low, is ultimately not an overly extreme reaction to being cheated on.