2.5yo DD's just started at pre-school one day a week. Ex sees her alternate weekends, just for the days and has no involvement in her day-to-day life. He knows she's starting pre-school.
In October she'll be going for an extra day each week due to a course I'll be doing. This is a temporary arrangement just for 3 weeks.
If these were days that she was spending with a friend rather than going to pre-school it wouldn't occur to me to inform him. (It's none of his business what courses I'm doing and I really don't want him to know about this particular course).
Is it different that she'll be at pre-school for those 3 extra days rather than with a friend? I suppose I'm just wanting to know if IABU by not telling him and if he'll have reason to be an arse if he finds out another way.
All gentle opinions appreciated 