Most Helpful Guy
It doesn't matter whether he still loves you. What if he does? You broke up because it didn't work. If you get back together, you will rediscover the same truth all over again, and then you will break up again. And, no, you are not so different from everyone else that you can make it work when no one else could.
However, you probably need to learn this for yourself. If you do try to reunite, pause and try to learn your lessons when it is over.
Most Helpful Girl
Signs that he still loves you would be that you're still together. When you love someone, even their most annoying habits will often become endearing, or at the very least bearable.
Even if he loved you, circumstances of you two being together are not the most practical. His bipolarity and depression make it harder for him, and no doubt him having not much patience for who you are and doing things like calling you 'annoying' would lead to an inevitable downward cycle in your own life as well.