Encouraging feelings of guilt in someone is not a productive or compassionate approach, especially when it comes to relationships. Instead of trying to make someone feel guilty, it's better to focus on your own growth, healing, and happiness.
If you're going through a difficult time after a breakup, it's essential to surround yourself with supportive friends and family, engage in activities that bring you joy, and give yourself the space and time to heal. Dwelling on making someone feel guilty may hinder your progress towards moving on and finding new opportunities for happiness.
Remember that each person's journey is unique, and comparing yourself to your ex-boyfriend's new relationship won't bring you peace. Everyone faces their challenges and growth opportunities in life. Focus on your own path and finding happiness within yourself. Eventually, you'll be able to let go of any lingering negative emotions and embrace a positive and fulfilling future.