I'm confess that I tried to flirt with my younger brother's ex-bf who is 15 and I'm 17. has anyone else been in my position ?
I am not sure I understand what you are telling me. why would flirt with your brother's ex-bf?
I really liked him so much and I knew why he rejected my feelings but in the end I couldn't take it
It's not right to flirt with your brother's ex. It will complicate your relation with your brother and imagine how much he'll get hurt.
It's okay, every problem has a solution.
Usually siblings respect the parents and exes of their other siblings and  do not date them. Doing so makes jealously and things get very complicated.