Hello, my name is Greg. I am so sorry to hear about your situation.
Was the date to be face to face? (since you say it is long distance relationship)?
It sounds like it is possible that he has feelings for both you and his ex (if I am reading your brief information correctly) and it is possible that this is causing some issues. I find that honesty is what is needed in these situations. Are there any shared friends that you have that you could contact who might have a better idea as to what has been going on with him for the last few days (since you usually talk everyday)... maybe there is an issue going on that you are not even aware of?