Text/call him and humbly ask:'Darling, are there areas that u find me not meeting up or some things u think I'm not doing right? Frankly tell me so that I can adjust,if not for this r/ship,at least, to make me a better person. I'm still learning in life and love to learn from u'. Try this b/4 u finally give it a quit.
Well, if u really have tried to such extent like u've said, and stil he is not giving u any meaningful response, u better quit,perhaps, he has goten another girl. Since he doesn't luv and care abt u again,I don't think he is worth dying for. Be strong and get on with ur life.