Julia Naftulin writes Insider's dating, sex, and relationships advice column Doing It Right.Julia Naftulin My ex and I were high school sweethearts. We dated for 10 years, moved to two cities together, and talked about marriage. In August 2021, my ex suddenly said he had to end the relationship to be alone. He said he didn't know if he could ever get married. A year and a half later, I've learned how to practice self-compassion, ask for help, and find gratitude after grief. When my ex-boyfriend sat me down to break up with me in August 2021, I didn't realize...