Monday's Emmys was Shookus' first public appearance since her split from Affleck after a year of dating. In August, the Justice League star entered rehab for his ongoing battle with alcoholism, an effort Shookus tried to inspire prior to their split, a source told ET at the time.
Emmys 2017: Ben Affleck Steps Out to Support Girlfriend, 'SNL' Producer Lindsay Shookus
"Ben had been drinking and Lindsay was encouraging him to stop," the source claimed. "At that point, he still didn't seem to feel he had a real problem. Sadly, he spiraled very quickly, and Lindsay felt helpless."
"Lindsay wanted Ben to go to rehab, but had trouble getting him there," the source added. "He didn't want to be controlled and ended things with Lindsay."
"Lindsay was supporting Ben in the beginning, but now he seems to be relying more on Shauna than Lindsay and she is devastated," the source said of how the SNL producer was handling Affleck's latest drama. "She believed he would get sober and they would work it out, but that isn’t how things seem to be panning out."