If someone is warm and engaging, responding to your messages, texting first, asking about you, joking, making plans, being affectionate, and then suddenly goes cold and distant, short replies, delayed responses, no effort, avoiding you, it’s one of a few things:

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It’s not a mystery, and it shouldn’t be confusing. The best course of action is to keep moving forward intensely with your self-development and maintain emotionally uninvested communication with her at a lower frequency. Remember, nothing is a big deal, and most of these are just games and unimportant.