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According to Star, Lopez's crisis erupted after she watched Affleck accept a Golden Globe.
"Ben winning that award hit her in a weird way," explaining, "She used to brag that she'd win an Oscar by the time she was 45, and that doesn't seem likely."
Lopez is also jealous of Affleck's love life, alleges the tab's purported "insider."
"Ben's wife [Jennifer Garner] is very successful and respected in the industry and J.Lo can tell that she and Ben are very happily married."
The magazine claims that "seeing her ex so fulfilled was a wake-up call" for Lopez, who is now feeling "very embarrassed about her own life."