I had a breakdown in school today, because my friend left me (by accident) and I started to feel abandoned which led to a breakdown, I tried calling them but they wouldn't pick up, I was waiting for an hour and I kept calling them. 
When I finally saw them I was really angry so I shouted at them, asking why they were ignoring me, they didn't seem to care very much and kept dismissing me, saying their phone was on silent and shit. 
I told them that I have BPD and them leaving me today hurt me a lot, they said I was being "emo" and that I should ignore my emotions.
We didn't speak for the rest of the day and now I feel like shit. Am I in the wrong? Should I hide my outbursts from my friends?