that person he's eating with is an omega , he showered his brother with love that he even turned him into an omega, he tells him not to say anything to his parents that they should be brothers, what motherfckin brothers fuck each other huuuuhhh???.. why won't they misunderstand when that older brother of his doesn't use communication as a tool!?? , so the younger brother is at fault cus of the overthinking??... hon remember you should not be with a man that doesn't make u feel secured okay... whatever the misunderstanding is ,the person who didn't clarify the relationship is fucking at fault..
So we are talking abt RL now? Okay then, first of all i will never sleep with so called BF or crush. There will be no second since the first stage already abolished.
Back to the story, i dont justify keeping secret like the ML did, from the first the main problem im keeping point out is "the bestie assuming without confirming first". If you really care abt MC then dont let him hurt from your assumption
I will suspect him too, if my friend have stepbrother who sleeping with her, but he ask her to not tell their parents
Is already enough to suspect everything he do in the future
So that's why the reader have a reason why he supports his best friend decision, because it's a normal decision you would do to your friend

I might appreciate his intention, but only his intention. He used the wrong method. He just assuming. Are 2 ppl eating or chating together counted as dating? Its a shallow misunderstanding. He can just verified if he sneaks up and listening to the conversation instead of "assuming"
For someone "care" to his friend, the method he used not even close to "care", he practically said it doenst matter if the MC got hurt in the process lmao, if you truly care you might want to choose another method.