My ex didn't take our son trick or treating

I got my son on his birthday (last week) so his dad got him for Halloween.I texted and called a couple times for two days beforehand. He ignored it. Finally I called his roommate, who is good friends with both of us, to make sure my son was ready for trick or treating. He was looking forward to it. I wanted to make sure he had whatever he needed and there were no excuses not to take him. The roommate told me he was good to go, and the dad called me back after to say that yes, he's taking him to trick or treat.Today I got him back and asked if he had fun trick or treating. He said "no, daddy said to wait" (to be fair he might have meant 'too late' as he has trouble with pronunciation). I looked at his dad who said "no, he said he didn't want to go!"I was devastated. More than my son was even. Angry. Guilty. I still am. After everything I should know better than to trust my ex, even with stuff for our son. But I did and my son missed out on something I can't redo. I can (and will) give him candy, but I can't give him that experience.He could have called me if he didn't want to take him. Maybe this is stupid and maybe I shouldn't be upset. But I really truly hate this feeling. via /r/Parenting https://ift.tt/2qnGgKt