
You should never MAKE someone chose. That’s toxic, you’re hurting them by doing that. You tell them how you feel and give them time make their choice but you never say “you need to choose”. It may be normal but it shouldn’t be, compromises is how to keep a relationship stable. Not “my way or the highway”.

It depends on the situation. In their case, Jungyeon really needed to choose one to not lose both. And look what happened, he chose one and ended up having both.
I just think that it's wrong for you to use the word 'never'. Imagine your lover cheating, would you say "It's okay. Take your time." instead of saying "Him/her or me?"
I'm so glad of the ending. Hyunjin is not toxic at all, he gave him a choice, time and space to think, just like what normal people do when trouble comes to a relationship. If you dont do it w your partner then you should practice it.