Most Helpful Guy
It's hard to tell really and you can't beat your self up over it... me and my Girlfriend broke up two weeks ago. And I went kinda crazy for a couple weeks. And now I'm regretting ever texting her/calling her because she got 10x more pissed off went from wanting to be friends to telling me to never talk to her again.
I personally think that maybe there is a chance for you but you really do have to leave him alone. If he is still hurting, every time you text him it's just going to renew those same feelings of hurt. It's time for damage control, just seriously leave him alone for a while and give him space. And you have to try to move on.
A good idea is to set a goal of at least 6 weeks, and more if you can handle it. And after 6-12 weeks just send him a text that's really casual. DO NOT ask for him back. Maybe something along the lines of you were doing something and it reminded you of him, something that you know what make him think of a good memory you guys had together.
If he doesn't respond wait another few weeks and try again, don't text him though if he doesn't text back... This is the best advice I have for you. But seriously try to move on so you don't get hurt again if he doesn't come back.