I think if you knowingly get involved with a married person, you're a piece of shit. If you're married and stepping out on your partner behind their back, you're a piece a shit. I don't care if you are straight, gay, or bi, I'll still think you're a piece of shit. End of story.
I come from a home which has been broken up twice by infidelity. If a married person does not love their partner anymore move on dont put people through this shit.