The very reason your friendship might end is if you don't say anything, say something, set boundaries, that's how a relationship last, if you just let it by and bottle your emotions, you will explode one day, and when that day comes that friendship is over. Just tell them, if they are truly as good as you say they are they will try to understand an...... reply
Most manhwa/manga i hate are just because of the plot so i don't think i would give them anything, i would ask them what they're trying to do to come up with that decision for the story though. Just curious reply