Bf 25M a weirdo lowkey. 25F

My bf 25m of 9 years, I think is a lowkey WEIRDO and I’ve brought it to his attention. His Bestfriend is a new relationship & I feel as though he is trying his extra most to be seen and noticed by this new gf. I’m embarrassed to share this w/ anybody else so I’ll share it in here. This gf doesn’t like her name and refers to herself by a nickname. When I genuinely asked my bf and his Bestfriend what her name was they refused to tell me as if this was a big secret, my bf was also persistent on not saying and even joking saying his bestfriend said not to say. Also I’ve noticed that he began commenting on his friends instagram right after the gf comments, the instagram post has photos of the new gf as well (I sound crazy but idkkk) this is not like him to comment on ones post so I find it pretty strange. My bf and his friend also play a sport together and often go out to eat afterwards, and usually the gf goes to the games & obviously goes to eat w/ them, but when I ask who all goes he forgets to mention the new gf. I know my bf isn’t cheating on me with his Bestfriend’s new gf but he’s definitely acting weird. Is there anyways I can prove that he’s acting a littlestrange and bring it to his attention without me sounding/liking like a crazy bat??