I have a boyfriend but I'm falling for a girl

Yea the title says it all I've been with my boyfriend for a while now and I've been hanging out with my bestfriend she's expressed to me she has feelings and everyone then she's been on my mind constantly I just I'm torn between the two I haven't cheated I haven't said anything to anyone can someone please help me before my brain malfunctions I love both of them the same way I can't decide what I want more her or him.