I think that we are all forgetting....

.... that Baek only recently started to become this attached and worrisome after meeting up with an old friend at a bar after work, who had just recently gone through a breakup. After hearing the details of how that couple drifted apart and eventually split up, Baek started to have fears of the same thing happening to his own relationship, contemplated his own status with Hyunsoo, and draw parallels between them and the other couple that broke up. Baek has too much time alone with his own thoughts and feelings lately, and they are running out of control like a runaway freight train. It is affecting how he sees his partner and his relationship now, and he is not communicating this to anybody. He is starting to take his anxiety of possibly loosing his partner like his old friend (which is not gonna happen) out on Hyunsoo without realizing it. Meanwhile, Hyunsoo is clueless about anything being wrong cuz Baek is hiding/masking it too well. Baek needs to open up and communicate to Hyunsoo ASAP!