Can Yall Help Me? with a few question?

well see im biual and uhh im dating a chick i have known her for a year and well i have a best friend and i made plans with my friend a weekago and well my gurl called me and said she wanted to go swimmin and well so i ditched my friend and told her i will make it up to her but i didnt tell her who i was gunna hang out with and so when i got home i told her and she tweeked out.and well im tryin to let her know im still her for her and shes not gettin.i wouldnt mind dating my best friend bcz i dont wanna lose her and she is to and she dont know what she wants and i mean i love my best friend with all my heart.i dont know how to convice her anymore that im still here.she thinks that i should just stay with my gurl and leave her out of it.should i brake up with my gurl?shes very controlin and my friend dont like her.i have known my friend for 2 years almost 3.we been threw a lot to.what should i do? im so confused.can yall help me with this. should i brake up with her? or stay