By Esther Jang (staff@latinospost.com) | First Posted: Aug 20, 2015 03:57 PM EDT

Robert Pattinson is reportedly having second thoughts about marrying fiancée FKA twigs, due to his past relationship with ex-girlfriend Kristen Stewart.

According to Life & Style's Aug. 31 issue, "The Rover" actor is seemingly doubting his future with the "Glass & Patron" singer because he misses his spontaneous former lover and "Twilight" co-star.

"Rob told pals that he misses the wild life he had with Kristen," a source revealed. "Twigs is her polar opposite, which is part of the reason Rob loves her, but he can't help but miss all the spur-of-the-moment things he used to do with Kristen."

"Settling down scares him a bit," the source continued to explain to the magazine, via Hollywood Life. "He says he's still in love with twigs, but he's just not in love with the idea of marriage anymore."

The source added that although his feelings for FKA remain strong, Pattinson is supposedly "hoping for a very long engagement."

The latest claim follows Hollywood Life recently reporting that the couple had decided to push their wedding date back.

However, there is nothing to worry about, since the delay is due to the "Pendulum" crooner taking her sweet time to plan her dream nuptials.

"Things are going very well, and they are both very happy with each other," an insider insisted. "Don't take this news as a bad thing - they just want to get it right because they only want to do it once. FKA wants it to be perfect and she keeps going back and forth on ideas."

Besides, Pattinson reportedly agrees with FKA and is willing to follow her decision.

"Rob is in no rush," the insider added. "He knows that it is going to happen and he's happy with that. He is fine with the delay because he's happy with their relationship. They spend time apart, but they make sure to see each other often."

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