"Holly knows this is the best for her," a second source had told E! News. "She realized he wasn't the person that she thought he was and that the person who he portrays on TV is not his authentic self."
Luke and Holly had reconciled early this year after he "ghosted" on Stassi Yaramchuk following their appearance on The Bachelor Winter Games.
Luke and Stassi appeared to leave The Bachelor Winter Games as a strong and solid couple, having engaged in long conversations and bonded over their similar heart conditions.
However, during the show's reunion special in February, Stassi told host Chris Harrison she had never heard from Luke after The Bachelor Winter Games finished filming in December.
Luke -- who has been the subject of public "player" and "cheater" accusations before -- told People that after The Bachelor Winter Games wrapped, he realized his heart really belonged to Holly the whole time, which was an explanation he attempted to use to justify why he gave Stassi the cold shoulder when she confronted him about his behavior on the reunion special.
Luke was also previously linked to former The Bachelor bachelorette Danielle Lombard in March 2017. He and Danielle, however, never got serious or became an item.