Responses

nah you don't get it. He wasn't just hurt by the words, "real family", Song Rik felt that his entire childhood trauma was invalidated by Jinhyeong who would rather hope that his abusive family will ever love him back instead of being with a real friend that more like a real family. It wasn't just a moment of betrayal, trust that was built up since their time in middle school was at stake here.
I'm sorry are we really justifying weeks of psychological torment compared to one moment of betrayal where the worst thing he said was "real family"