need help understanding my outbursts
there is this boy in my class whose presence makes so mad, last year we used to be good friends but then he got a slight glow up and changed his personality slightly, he became more calm. however, we still stayed friends, and it's not that he didn't like me, but it's that i didn't like him anymore, him approaching me,speaking with me, shaking my hand, or touching me in any way makes me so mad and i end up yelling at him for reasons i don't know. This is more severe when he speaks with my bsf, i don't like her talking with him not because i'm jealous, but because he acts with her like i do, and i don't like when people act like me, especially not with my bsf. He often asks me why i'm mad at him and i just tell him to get lost because i myself don't know. And no, i have never had even the slightest romantic interest in him.