There could be various reasons why your ex is suddenly being unfriendly and cold towards you, even if the breakup was relatively peaceful. Here are some possible explanations:
Emotional processing: Sometimes, after a breakup, individuals need time to process their emotions and heal. Even if the breakup was peaceful, your ex might be going through a period of emotional adjustment, leading them to withdraw and create distance.
Boundaries: Your ex might be trying to establish clear boundaries after the breakup. Being unfriendly and cold could be their way of signaling that they need space and want to limit contact for the time being.
Moving on: Your ex might be trying to move on with their life, and being unfriendly could be a way of detaching themselves emotionally from the relationship.
Mixed feelings: Even in a peaceful breakup, it's common for individuals to experience mixed emotions. Your ex might still have residual feelings for you but feels it's best to keep their distance to avoid potential confusion or rekindling the relationship.
Influence from others: Sometimes, friends or family can play a role in shaping someone's behavior after a breakup. They might have advised your ex to create distance to help them move on or protect themselves from potential hurt.
New relationship: If your ex is in a new relationship, they might be focusing their emotional energy on their new partner, which could lead to them being distant and less friendly with you.
Self-preservation: Being unfriendly might be their way of protecting themselves from any emotional vulnerabilities or triggers associated with the past relationship.
It's essential to recognize that your ex's behavior is not necessarily a reflection of your worth or character. Everyone deals with breakups differently, and their actions may not have anything to do with you personally. While it's natural to seek closure or understanding, it's also crucial to respect their boundaries and give them the space they need.
If you want to address the situation and seek clarity, consider having an open and honest conversation with your ex when the time feels right. However, keep in mind that their response might not provide all the answers you seek, and it's essential to focus on your own healing and well-being moving forward.