Anyone who didn't see the ending coming by half way through should be embarrassed.
It looks as if the director insisted the actors look bored for every single scene, the film struggled to fill the 90 minute run time and an entire main character was only there for set dressing because presumably they realised last minute they wouldn't fill enough screen time with only 3 relevant characters. The film also seems tonally dissonant to what it portrays, it acts as if the characters are liars when actually from the flashbacks it's clear that what they said was so close to the truth as to make lying in that way redundant and absurd.