I don't know your boyfriend, but I would say that as a rule, when it comes to Aspies, reliability is not always our strongest area. I think it's to do with unintentional self-obsession... we quite often get wrapped up in our own thoughts and problems for periods of time, but do tend to 'snap out of it' in the end.
I can expand this a bit, so if you find that up there helpful then PM me anytime. =]
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'I may not amount to much, but at least I am unique.' ~ Jean-Jacques Rousseau
'I sometimes go to my own little world, but that's okay, they know me there.' ~ Joel Hodgson