What happened?

My ex had my son (not his child, just a friend of his son's) today. We walked to school together, chatted okay, walked home together. I said I'd pick up my son later on, I have a normal time. Just before I pick him up, somebody is going through my photos on Flickr (he's also into photography), then all of a sudden my son is kicked out of his house and delivered here. Another child was there, but not kicked out, just my son. My son said nothing happened, he just walked up to him and said "come on, it's time to go".

Now he was either avoiding seeing me (going down there), but he'd walked to school (I do this daily, he never picks his son up), or something about looking at my photos pissed him off. I'm okay, not as good at him. I just don't get it.

Aah, I'm just ranting. I just don't know why he'd instigate us walking up to school together and a playdate and then suddenly kick my kid out of his house immediately after going through my photos (he and one other person know the url, nobody else).