I don't really have anything to contribute that others haven't already articulated (better than I could, too), but it does really come off as he is still shirking responsibility in terms of not wanting to be the person to end it. If AP had answered that email, do you think this convo would happen? If you look at his actions, even within that 24 hour span, they don't align with what he is saying. I am sure he wants what he is saying to be true, but he can't speak it into existence - he has to actually do it. He's put off making a decision on this for years - and still can't really do it even when the variable of you knowing about it appears.
Have you talked to your mom about it? I know you wanted to but he asked you to put it off.