everything in this world is based upon vibrations and energy exchange. i'm a firm believer that holding negative energy doesn't benefit the person or people around them. First, it starts weighing you down and then builds momentum and spreads outward. Even if a person is not in tune with the spiritual world they still have feelings that arise when they think of a person they just don't realize the origin of them. So if a person feels resentment and hate and just keeps pushing that energy toward the other person, that person not consciously will be turned off. Even when i was less "awakened" or whatever you want to call it, I can feel from a million miles away if a person f*cked with me or not or if they liked me. I wouldn't even need to be around them. maybe they won't be like oh i feel this way because of this but instead of positive feelings when they think of you, itll be negative feelings. This is why things usually happen when youve moved on or doing other things because you stop thinking of them both good and bad. If when you look at the situation and all you feel is regret and resentment youre still feeding negative energy. It's best to just stay neutral cause when youre extremely happy then youre extremely mad, the energy keeps bouncing back and forth