Same sex relationship cheating (no rude comments)

First off no rude or homophobic comments! Is it cheating if your bisexual and you hook up with a person of the same sex???  Be honest! I've had a female friend who cheat on her boyfriend and she said oh I'm bisexual it's not cheating if I hook up with another girl 😑 cheating is cheating no matter if your stright bi gay or lesbain I lost respect for her cuz she had a good man and cheated on him all the time with women that's how I feel if your going commit to anyone weather your gay bisexual or stright cheating hurts!