Am I overreacting ??

( First of all, I have to warn you that I’m not an english native speaker so I’ll do my best to make the less mistakes I can )

I will name my boyfriend Matt and MY girl best friend Zoe.

About Zoe, I’ve known her since i’m 6, she’s been closest friend. When we turned 12, we met another girl and now we’re a sort of trio with the other girl, we’ll name her Sofia.

About Matt, I know him since I’m 12 too, we were in the same class but didn’t paid attention. Then we became friend when I turned 14.

Actually both Zoe and Matt are in my class, we’re a group of four with another guy that we’ll name James. When Matt confessed to me, Zoe told me she had feelings for him too, so I was like then I won’t go out with him but then she told me it was ok and nothing serious. ( She always fell in love with any guy who give her the minimum attention )

But recently, I started to think that Zoe and Matt are a bit touchy and very close, but actually the one doing the first step, is Zoe. She even gave him romantic nicknames :/ .

Yesterday, we went to the computer room ( during class ), Zoe sat next to him, in between of the both of us.

[ Matt ] [ Zoe ] [ Me ]

They kept talking during the WHOLE hour and didn’t even pay attention to me, they even did the homework together, laughing.

Or in P.E they always practice together even though I’m here and that we’re supposed to do it in groups.

Even James look at me with pity whenever they’re doing something cause he knows they’re wrong for that.

and EVEN Sofia but she tells Zoe to stop acting sus around my bf, Sofia isn’t in our class but I’m pretty sure that if she was she would ask Zoe the hell is wrong with her.

Fr guys it makes me so sad it’s not the fact that he’s friend with a girl but the fact that if you look at them, it would look like they’re in a relationship and that i’m a fucking third wheel.

I’m that person who walks behind when the road is to small :( fr it even happened earlier.

Btw she also keeps asking me things like “When are you and Matt breaking up ?? “

It breaks my heart.

there are other incidents actually but now I just need your opinions, please answer me, ty.