I'm so fucking tired of this shit

Why do authors kept making the side ml, who's obviously going to lose, so much better than the main ml. It hurts seeing the mc kept picking the toxic ml that keeps hurting/abusing him one way or another than the side guy who treated him much better. (God i'm starting to sound like one of those "nice guys" incels, but you know what i'm talking about). Though some ml does treat the mc nicely, the author still find ways to make a side character that outshines him. Like the black haired guy from unripened expression, sure the main ml is not bad, but the black haired one was so much better, he shared the same pain as the mc, has better dynamic, and was the one who stayed by his side and supported him when he was at his worst, but the mc still turned him down half assedly. Why? What's the point of making such a good character just to use him as some sort of leverage or plot tool for the mc's relationship with the main ml. God it's so frustrating to the point i started to ship the mc with girls even though i like bl better, like the mc from kiss me liar, the ml was so bad i started shipping him with emma, a girl who had a crush on him and treated him way better and actually tried to take care of him. Ugh fuck sorry for the rant, i'm just really fucking pissed rn