A work friend had a new job and is leaving. There is a group of us that are friends at work. We have a group chat but me and this girl also message each other outside of it and have a laugh and tag each other in things on social media. We have a lot in common and talk alot at work. We are similar age however I'm part time and she is full time along with all the others who are also FT. I thought something was happening as I saw she was whispering with one of the girls, saying how stressed she was. I just knew something was happening. However when I asked her why she was stressed she didn't say and the other girl butted in saying she was just a "stress head" I feel like all the others knew and she decided not to tell me?? I don't gossip or tell people's secrets so AIBU to feel upset that she didn't tell me and that the others knew?