What, exactly, was the reason you broke up with him? Because he couldn't articulate how he was feeling, or was there a deeper issue between you two? Sometimes, relationships reach their breaking point, or they just crumble and fall apart. As you get older, you will realize this happens more often than not. I wouldn't recommend trying to be friends, at least not right away. You both need to allow for some healing time, and to mourn the relationship, and that is best done separately. Try focusing on things you enjoy: your friends, family, hobbies, etc. Focus your energy on positive things that bring you joy, and let him do the same. Over time, you won't question everything as much. You probably won't get all the answers you are looking for, but you will eventually find peace within yourself, and you will be able to move on.
"Caring is not an advantage."