Really bad feeling about my flatmate ?

At the start of the year, I moved in with three other people. A couple and a guy. The guy is never around because he fell out with the boyfriend (they use to be really close). I’m not friends with any of them and I have my own group of friends but we just all live together. Now, I don’t really know them well but I’ve had a couple conversations with the couple when in the kitchen. The girlfriend seems sweet, but for some reason I get a really bad vibe from the boyfriend.

He’s never been rude to me and we have had decent conversations, I’ve actually spoke alot more to him than the girlfriend because he’s around a lot more. However, I heard him talking smack about his girlfriend’s best friend and the girlfriend just kind of agreed. She also cleans up after him, I saw her brings his plates down once, and she has brung food up to him (I’m not sure if this is the case all the time, just from what I’ve seen). She is a lot more quiet than him, once he got frustrated at her for not making popcorn right. Although it wasn’t aggressive and it was kind of jokey she sort of laughed it off (I think she was embarrassed cuz I was there). He helps her with her projects and stuff, like I said I don’t know their relationship that well and I’m barely around this is just what I’ve witnessed.

But the past few days she’s been away and I’ve been stuck with just him in the house. We’ve been having some convos about general stuff and getting along BUT the more I talk to him the more I have this bad feeling about him even though it’s just normal convo, is this normal? I get extreme narcissist vibes from him but I’ve never had such a bad feeling about someone before. The other day he also randomly “let me know” that the dishwasher was finished at like 11.30 at night, which I found quite rude. Am I being rational?