1. Fear of Commitment: He might be apprehensive about long-term involvement and backs off when things start to feel serious.
2. Distraction: Other aspects of his life, such as career or personal issues, may have taken precedence, leading him to unintentionally pull away.
3. Dating Multiple People: He could be seeing multiple individuals simultaneously and decides to pursue another relationship.
4. Not Ready for a Relationship: Despite initial interest, he might realize he's not emotionally ready for a partnership.