I can't speak for others, but while interests may come and go - love for a person is quite different. The only thing that can stop my love for someone is the recipient squashing it with cruelty, in which case she'll be dropped like a hot potato.
Just how nasty was this ultimatum you gave him, etc? It's possible you were so mean (whether or not you meant to, due to flash of anger, etc.) that you turned him away for good. [shrug] Hard to say...
I find it unlikely an aspie would lose interest in their loving partner for something like a video game, etc... rather, merely distracted by another interest before they put it down and come back to you.
You'll have to ask him yourself. Nicely. 