'Pretty Little Liars' season 6 spoilers: Is Hanna really okay with 'Spaleb' in episode 16?

Spencer and Caleb deals with Hanna's disappointment in the upcoming episode of "Pretty Little Liars." Facebook/prettylittleliars

Hanna (Ashley Benson) is not okay that one of her best friends is dating her ex-boyfriend and she will make her feelings known in the upcoming episode of the hit series "Pretty Little Liars."

When it became obvious that something is going on between Caleb (Tyler Blackburn) and Spencer's (Troian Bellisario), the blonde Liar was cool about it. She may looked like she got the biggest shock of her life when Spencer admitted that she was attracted to Caleb, but she still gave her blessings in the end. The truth is, Hanna was stunned to learn that the pair spent some time together when they were both overseas. She had no inkling that Spencer finds Caleb attractive and vice versa. After all, they spent a lot of time together in the past, when Caleb was still with her and Spencer was with Toby (Keegan Allen).

In "Where Somebody Waits for Me," CarterMatt reports that the trio will finally deal with the complicated web created by the birth of the new relationship. As Hanna's old friend, Spencer knows how much the blonde sacrificed for her relationship with Caleb to work. They were together for a long time and she knows fully that they loved each other a lot. Now that she is dating Caleb, Spencer must be feeling guilty. As for Caleb, no one knows what he is thinking. Hanna appears to be happy with her new fiancée. They had a clean break and parted as friends. Although he is breaking an unspoken rule by pursuing her friend, he sees nothing wrong in being happy again. Will things work out okay for the trio?

Meanwhile, Blackburn shared with Vulture the cast's reaction when it was revealed to them that Spencer and Caleb would be dating in season 6B. According to him, the rest was okay with the news except for Benson and Allen, who were visibly shocked with the turn of events.

"Ashley was really upset. Keegan was a little more stoic about it, but I think he was pretty upset as well. They have to go with the flow, though, right?" the actor said.

"Pretty Little Liars" season 6 airs Tuesdays at 8 p.m. EST on Freeform (formerly ABC Family).

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