In case you and your clingy ex-girlfriend are enrolled in the same college, are coworkers, or share a child, you can’t completely go no-contact. Things definitely become tough when you gotta stay connected. However, you can’t afford to become outright rude unless they pester you unnecessarily and you don’t have a child involved. If you have a child, create strict boundaries about when and why they can reach out to you. Ensure your child doesn't get affected by the situation. However, if you’re only coworkers or college mates, you can become stricter and avoid them for good unless it’s serious.