Haha it's just that, it's was serina who jokingly say he might cheat when he gets lonely as they will be in ldr and when the ml didn't refute that he was the one who has the nerve to get angry? Like you're going to be in ldr the least you can do is put your partner's mind at ease by not opening about your possibility of cheating. (They're both insecure about their relationship at this stage and he added fuel to the fire)
Haha may be I was just sensitive to such comments cause one who is pursuing me made similar comments about the possibility of being attracted to others when I'm not there like hello? You're just still in the pursuing phase and I'm hearing this to you? Then go, no one's stopping you. Leave me alone
Sorry not mean to remind you bad stuff
I would also hate it if they'd brushed it off like nothing, but they did realize how bad it was and tried to apologized and made up to each other.
Everyone makes mistakes esp when you're young and overthink stuff. But also maybe bc I've never been in a relationship or in similar situation so it didn't annoy me that much.
It's ok, just really remind me of the things that I always need to watch out for. Like, I also never been to one but most of the time they just voice out that they're interested with me but not enough to be pursued or others really did but didn't follow through and I really have a high standard specially in the beginning like I have laser eyes and ears with everything they do. I'm just really an overthinker
Anyways, yes it's also good that they're able to immediately mended it.

Dude, I would also feel bad if my partner said that to me. Like, huh, are you even able to think that? Don't test me(╯°Д °)╯╧╧ well it's just my take