Send him a text. Tell him how much you love him and you can work out what led to the breakup. If he doesn't respond, text him by telling him that you're patiently waiting for his response. Don't contact him for more than two weeks. If he doesn't respond in that period, contact him. If he doesn't pick up your phone or reply to your text, don't bother him. Continue with your life. You will find someone else who loves and understands you.