you made a mistake,yes.if he doesnt accept your apolgy,fuck him.but hes not the only one to blame.a little snitch like that should not ruin your realtaionship.and if u like this girl,go for her.i myself am bi too,but i told by boyfriend from the stsrt.even tho i hadnt realized the fact until i persued a realationship with him.but if it doesnt wprk with your boyfriend,go for ther girl.goodluck.