Yeah, you're indeed insensitive. What he did is reasonable though. Rather than confronting the seme directly, ofc, he needed evidence first and the evidence (exchanged text messages) somehow kind of questionable. Which if I were in his shoe, I'd overthink the same. That comes right there the confrontation aka the communication part. The seme enjoying the uke's jealousy is understandable, tbh.
Me when I’ve never been in a relationship in real life
I think being insecure abt being cheated on considering the circumstances is valid, so while the MC definitely should take a minute to not make any grand accusations, I don't think he's exaggerating in trying to see if there's any evidence or being emotionally charged when confronting his bf about it. As long as he doesn't say anything intentionally hurtful or like "let's break up" before he's given a chance to the guy to explain himself
But the ML is an idiot. He's quite literally and INTENTIONALLY withholding the truth, prolonging the MC's distress and worries just so he can get the satisfaction of seeing him jealous?? Nah that guy needs to crawl on all fours and ask for forgiveness
Call me insensitive or anything, but I seriously think that MC is overreacting (again, communication where are you!?). You can just ask who is that guy, why were you two together in the smoking room, why are you so close with him. Not immediately acted 'Why are you two there!? What are you two?? Are you cheating on me!!?'
(Well, if it were me, I'll answer, "Can you just calm down and ask first before making your own assumption?")
Well the ML is also at fault. He knows MC is thinking negatively and he shows how happy he is seeing jealous MC first rather than explaining the truth? Even though what MC think isn't true, bruh you deserve a slap-- no, a punch.