Should I be upset?

Okay so a little back story is that almost every relationship I’ve been in I have been cheated on. I’ve even been cheated on by the guy that I thought was the one and that I thought was a good person. Okay so now I’m in a new relationship and just last night I was having a panic attack about being cheated on again because I have ptsd from all the other times. And my bf is in Florida (we live in Illinois) at a party right now and he knew I was crying and panicking and he was being super sweet about it, so I calmed down and went to sleep. Well wake up this morning and on his story is a standing picture of him with a beer and his arm around a girl. Now one of the things that is really upsetting me is that he hasn’t posted any pictures with me or of me yet. BUT HES TAKING PICTURES WITH GIRLS HE DOESNT KNOW????? Do I sound crazy or am I right to be upset??

UPDATE: I confronted him about it and he got mad and we broke up!