It sounds like you've been through a challenging time, and it's understandable to feel regret after ending a relationship that was important to you. Here are some steps you might consider:
1. Reflect: Take some time to understand your feelings and the reasons behind your anxiety. This can help you communicate more clearly if you decide to reach out to him.
2. Apologize: If you feel ready, a sincere apology can go a long way. Acknowledge your past actions, express your regret, and explain that your anxiety was a factor.
3. Express Your Wishes: Let him know that you value the time you spent together and that you're interested in starting anew. Be honest about your intentions and feelings.
4. Give Him Space: After you've reached out, give him the space to process his feelings. He may need time to consider your proposal or to heal.
5. Respect His Decision: Whatever his response, it's important to respect his feelings and decision, whether he's open to rekindling the relationship or not.
6. Seek Support: Consider seeking support for your anxiety, whether through therapy, support groups, or talking to friends and family. Managing anxiety can improve many areas of your life, including relationships.
Remember, it's okay to ask for a second chance, but it's also important to prepare for any outcome. Good luck!