i recently broke up with him and i kind of miss him because in retrospect, our relationship may have actually been healthy. sure, we didn’t have the same interests and such, and he wanted me to pay attention to his but rarely did to mine,
This is the part you should focus on because a good partner will still engage with your interests out of love and respect for them.
but what if he was actually a really good boyfriend?
It seems like you wanted them to be a good partner more than they actually were. You deserve someone who treats you as well as you treat them.
You are still young. You have time and sadly time is the only cure for heartbreak.