I can offer some possible reasons why someone might behave this way:
Regret and Guilt: Your ex might genuinely regret how the relationship ended or feel guilty about their past actions. They might want to alleviate their guilt by expressing their remorse, even if they don't intend to rekindle the relationship.
Seeking Closure: It's possible that your ex reached out to find closure for themselves, hoping that by expressing their feelings, they could find some resolution or inner peace.
Ego Boost: Sometimes, people may reach out to their ex-partners to get an ego boost or reassurance that they were once loved and valued.
Loneliness or Nostalgia: Your ex might be feeling lonely or nostalgic, prompting them to reach out to someone from their past, even if they don't have any intentions of rekindling the relationship.
Manipulation: In some cases, individuals with certain personality traits or disorders may use emotional manipulation to evoke a response or emotional reaction from their past partner.
It's essential to prioritize your own well-being and emotional health. If the interaction has brought up much hurt, it's okay to limit or cease further contact. Set boundaries that protect you from any unnecessary pain.
If you find that you're struggling to cope with the emotions brought up by this interaction, consider talking to friends, family, or a therapist who can provide support and guidance. Remember, healing takes time, and it's okay to take things at your own pace.