Stop putting yourself through pain. Hes obviously happier without you now. You dont need to try anymore. Why try when you no longer have to cry over someone of the past. Dry your precious eyes cause everything will be okay. He left, and without a word or a without reason. He left you to give room for people to treat you better. He left you with bittersweet memories and the lessons learned. Breathe and let go. Trying to talk to him, trying to figure out where you went wrong, and wasting even more time to check up on him isnt doing you any good. Just let go. Though it hurts now and it will still hurt later,stay strong and stay positive