Chainsmokers' Alex Pall exposed for infidelity by longtime girlfriend: DJ was caught cheating in home surveillance video

Just three weeks ago, they were vacationing together in Aspen -- but things have quickly fallen apart for The Chainsmokers' Alex Pall and his girlfriend of four years, Tori Woodward.

Woodward put her now-ex on blast this week, revealing that she recently learned the DJ has cheated on her "countless" times. The evidence was indisputable: Home security video showed Pall making out with another woman while grabbing her rear end.

After posting clips of the encounter on Instagram, Woodward wrote that Pall explained that "because all men do it it's not that bad, and ... that because he's famous now he has a different rulebook for decency." She added that he "hasn't even apologized."

Huge shouts to Tori Woodward for standing up against powerful men like @AlexPallNY@TheChainsmokers

Men need to learn to respect women in all ways as fellow humans. Just because you have “power” doesn’t mean you can or should do whatever you want.❤️ #TimesUppic.twitter.com/CXH3Ywu10o

— Lizard (@lizloves_u) January 16, 2018

"After hours of begging him for scraps of honesty I chipped away just enough to confirm that this is not the first time he’s ... cheated on me," Woodward continued. He allegedly begged her not to go public with the information, telling her, "You're better than this."

She responded, "That’s right I am, but you’re not."

Woodward and Pall began dating just around the time when The Chainsmokers hit it big in 2014.