Am I just delulu or paranoid

Guys, I need help. Please do give advice.
So my boyfriend went on this outing, and there’s this one girl there. At first, he told me she likes girls, but when I asked again, he said he wasn’t sure and that she probably has a boyfriend. I got curious, so I looked her up on social media — and I found out I’m blocked. I’ve never even met this girl, never talked to her, nothing.

I kept asking my boyfriend what’s between them, and he keeps saying there’s nothing. But my gut is telling me something isn’t right. I don’t know if I’m just being insecure, but it feels weird. Like, why would someone I don’t even know block me? And why does he seem unsure about her all of a sudden?

Please give me advice, because I don’t know if I’m just overthinking or if this is something I should really be worried about.

i know this isn't the right place to ask but please do help