Pay attention to your family and friends. If you neglect your family or friends because of your relationship, now is the time to make it up to them and understand how important these people are for you.
Do not jump immediately into a new relationship only to make your ex jealous. There is no way to get the new relationship to work if you have started it for this reason.
After each failed relationship, take notes on your mistakes. Never regret something in the past; it teaches us not to repeat the same mistakes. Without the past, you will have no future.