It's challenging to determine someone else's motives with certainty, but I can offer some possible explanations for your ex's behavior. Keep in mind that every individual is unique, and there could be various reasons for her cold and unfriendly attitude towards you:
Emotional Healing: After a breakup, people often need time and space to heal emotionally. Jumping into a new relationship soon after a breakup doesn't necessarily mean she has fully processed her feelings or moved on. She might still be dealing with unresolved emotions from your past relationship.
Protecting Herself: If she was hurt by the breakup or feels vulnerable, she may be protecting herself from potential emotional pain by keeping her distance and being unfriendly. She might fear that engaging with you could lead to reopening old wounds.
Anger or Resentment: If the breakup was difficult or if there were unresolved issues between you two, she might still harbor feelings of anger or resentment, which can manifest as coldness and unfriendliness.
Respecting Boundaries: She could be setting clear boundaries to maintain a healthy distance and not send mixed signals, especially if she is in a new relationship.
Wanting Closure: If the breakup was sudden or if there were lingering questions about the relationship's end, she might be processing her feelings and seeking closure before feeling comfortable interacting with you in a friendly manner.
Reclaiming Independence: After a breakup, some people focus on establishing their independence and identity outside of the previous relationship. Being cold and unfriendly might be her way of asserting her autonomy.
New Relationship Dynamics: The dynamics of a new relationship might be influencing her behavior. She could be prioritizing her new partner's feelings and maintaining a boundary with you to avoid potential conflicts.
Moving On: Her focus on a new relationship might simply indicate her desire to move forward and explore new possibilities in her life.
Whatever her reasons may be, it's essential to respect her boundaries and give her the space she needs. If you genuinely regret your past mistakes, focus on your personal growth and learn from those experiences. Give her time to process her feelings, and if the opportunity arises, approach her with sincerity and empathy to have an open and honest conversation.
Remember, healing after a breakup takes time, and each person has their own pace and process. It's essential to be patient and understanding while also taking care of your own emotional well-being.