There can be various reasons why your ex is not leaving you alone, even though he's already seeing someone else. Some possible explanations include:
Emotional attachment: Your ex might still have feelings for you and is finding it challenging to let go of the emotional connection you shared. Seeing someone else doesn't necessarily mean he has moved on emotionally.
Insecurity: Your ex might feel insecure in his new relationship, leading him to seek validation or attention from you to boost his self-esteem.
Jealousy: It's possible that your ex is trying to make his new partner jealous or to get a reaction from you as a way of validating his new relationship.
Closure: He might be seeking closure or clarity about the breakup, and this could be his way of trying to understand the reasons behind the end of your relationship.
Control or manipulation: Some individuals use tactics like keeping in touch with an ex to maintain control or manipulate their emotions.
Habit or familiarity: If you had a long and meaningful relationship, he might find it hard to break the habit of talking to you or seeking your company.
Regret: He could be regretting the decision to end the relationship and is trying to gauge if there's a possibility of rekindling things with you.
Loneliness: Even though he is with someone else, he might be feeling lonely and seeking comfort from you, especially if you were close in the past.
Regardless of the reasons, it's essential to set clear boundaries and communicate your feelings to your ex. If you don't want to maintain contact, let him know firmly and respectfully. Avoid engaging in conversations that may give him mixed signals. It's crucial to prioritize your well-being and emotional health during this time of healing and moving forward.
If his behavior becomes intrusive, harassing, or threatening, consider seeking support from friends, family, or even legal authorities if necessary. Your well-being and safety should always be a top priority.