Is this cheating? MILF sneaks blowjob as she fucks cuck hubby

MILF fucks hubby thru swingclub gloryhole. As she backs up on his dick a stranger demands a BJ. He gives her mouth a slut fuck grabs her head jams dick down her throat. Cuck sees her with cock in her mouth gets angry gives her rough public fuck. But was MILF cheating or just being friendly? What's YOUR opinion?