DearDaughter.
It's no use, endlessly crying over "spilled milk" dear. Gather yourself together and move on more intelligently. A broken relationship isn't the end of life. If he is too blind to see what a blessing you're or would have been to him, then let him go.
You can't afford to "throw in the towel" at Relationships because of one failed experience. Someone wrote " Someday, someone will walk into your life and make you realize why it never worked out with anyone else."
Good Morning and Have a blessed week.