Boyfriend [23M] asked me [22F] very inappropriate questions about my gay cousin [22M]. Should I end things over this?

I'm in a little shock right now. My cousin has also been my BFF since we were little babies so we're very close.
Last night my boyfriend (of 7 months) asked me some very inappropriate questions. He initially asked me if we he can ask me some questions about my cousin. I honestly thought it's basic questions to get to know him so I thought sure.
He then asked me if my cousin is a top or bottom! I was like WTF how is this any of his business and I told him that it was a very inappropriate question as it's really a very private matter. He apologized and said he didn't know as other gay people that he knows are pretty open about this. I don't buy this at all.
About 10 minutes later he asked how my cousin's ... size compares to his?! Again I was in shock. I told him the same thing as his first question, later he also asked weird questions about his masculinity and those stuff. Again I think it was very inappropriate. He asked what clubs or bars my cousin frequents and that was when I asked him to drop this conversation entirely and he did.
But I've been thinking if I took this lightly as the more that I think about this, the more I realize how incredibly creepy this was. Am I right to have red flags appear all over my mind when I rewind things in my mind?
Tldr: Boyfriend asked inappropriate questions about my gay cousin and I'm feeling it was incredibly creepy. Should I end things over this?


Source.

Sounds like your bf is bi