I completely understand what you're going through. Adding to that, I am passing through the same thing. Having depressive episodes, mental breakdowns, wondering why he left me just for a minor problem. But let me tell you something: it's not our fault.
I don't know what you're feeling right now, but I know that it must be horrible. The feeling that someone isn't interested in you the same way you are in them is just something that could break you down. I have to warn you that it won't be the last time you'll feel like this. There's a lot of people in this world who tell you something but they mean the opposite of it. They want you to be in the palm of their hands just to increase their egos, using you as an object to fullfil the void in them. You don't deserve someone like this.
There are a lot of people who says that we're bound to be in love. We're built to feel this way - pain, loneliness, emptiness without them - and with them, only joy and hope for a better future. But I think this isn't easy. "Broken" people aren't bound to love others. People that are depressive whose energy is to heal others don't have to pass through this. You deserve someone who understands what you're passing through and is willing to help you in this journey.
Just one advice: don't send ANY messages to him. He don't deserve you. I can tell that you're kind and wonderful. Do not let yourself down just because of someone like him, because he don't deserve you. Even if you try to solve things, trust me, he won't identify what he did wrong if he don't want to keep going with this. Someone with an empty personality, being pretty or not, isn't worthy of someone like you.
Like I said, I'm going through the same thing, so you can count on me. You will get over this. Good luck ♡