It's difficult to determine the exact reason for your ex not replying to your message without more information, as there could be several possible explanations. However, I can offer some insights into potential reasons for his lack of response:
Lingering emotions: Even after a significant amount of time has passed, emotions from a breakup can still be present. Your ex may have unresolved feelings or may not be ready to engage in communication yet.
Hurt or anger: Unfriending and unfollowing on social media can be perceived as a signal of rejection, and it's possible that he might be feeling hurt or angry about it.
Moving on: It's possible that he has moved on with his life and no longer feels the need to communicate with you.
No contact decision: Your ex might have made a conscious decision to maintain no contact with you as a way to protect his own emotional well-being or to respect the boundaries he set during the breakup.
Misunderstanding: There's also a possibility that he missed or overlooked your message, or it got lost among other notifications.
Given that he was the one who initiated the breakup, it's important to recognize that he might have his reasons for not responding. If your intention was to reconnect as friends or try to rebuild a relationship, and he hasn't responded positively, it might be best to respect his decision and give him more time and space.
If you are genuinely concerned about the situation and would like some clarity, consider sending a brief and respectful follow-up message expressing that you hope he's doing well and that you wanted to check in as friends. However, avoid pushing for a response or dwelling on the situation. Ultimately, it's crucial to focus on your own well-being, healing, and personal growth during this time.