Lol. If that's your definition of serious relationship, sweating the small details. Then what would call a relationship with open communication? Dream like? And oh My boyfriend and me has been together for 4 years. I'm not sure if you can call it serious since we talk about things rather than jumping to conclusions.
Suspicion, and ending with a dot is a different things. He clearly said, "You already have a lover." Also why would be suspicious of a someone just asking you if you're looking for the person you want to talk to? Don't you trust your partner, to the point that simple "Are you looking for ..." Made you suspicious? That's definitely shallow.
He's OA and Overthinking small details. Who in their right would think
about cheating, just because someone picks up the phone. Like, why are you so shallow, then the one who would make things right is the Seme, when the ones whose OA and Overthinking kt the Uke. Smh.