This happens semi frequently. He also has high functioning ASD.
We'll have a time were planning to FaceTime/chat. He'll usually get in touch an hour later apologizing and either try to call back or suggest another time. Sometimes he even misses the other time and calls later again. I'm not happy with this behaviour.
I've told him it upsets me and makes me feel like not a priority. Inside it makes me wonder if he really loves me although it seems like he does when together. He apologizes and says he gets caught up other things and he has a lot on.
He messages every day so keeps in touch but I find it hurtful and I feel like a broken record?