A source tells the magazine that Maci was pushing for more commitment from Kyle.
"Maci wanted something way more serious," the insider says.
"She was never happy enough just being a couple. She always wanted more, more, more, whether it was a ring or another baby."
Maci and Kyle have known each other since they were seven years old, and since getting together around Valentine's Day in 2010, they were adorably inseparable. Kyle soon became a big part of Bentley's life.
"It's really sad because they love each other, but she pushed him away," the source says.
For more details, pick up the new issue of Us Weekly.