When I get into a confrontation with another person, especially if it's someone close to me, I usually start saying tons of stuff than I end uo forgetting when I calm down. 

It's kind of like a Jekyll and Hyde situation. Lat time it happened was around 2 weeks ago during a trip with my friends. I got into a tiff with my best friend, and the next thing I remember was her saying she wante to get away from me. Everything I said in those 30 seconds (it was a really short yet impetuous fight) completely vanished off my mind. 

What does this mean? Am I splitting? I really wish it could stop since that led me to having no friends, and I would like to prevent it next time I feel it coming.