Is my new friend being mean on purpose or just thoughtless?

So I noticed these two girls who seemed interested in being friends... they act weird.

For example one of them had created a group with me and the other girl (they both know each other from before). We met up etc. Then at some point the one who created the group started talking about some outside plan (which I wasn't invited to) and the other girl said, "See you tomorrow! <3" etc. I thought it was rude that okay they're meeting but why do they have to bring it up at all in front of me. They were coordinating transport/logistics but again they could've just privately messaged each other.

Then recently me and the other girl were talking and she asked where I wanted to meet I suggested a new restaurant in town. She was correcting me a bit so I set a boundary. i also said let's wait to see closer to the day (as it's packed due to popularity) or we could go (another place). She said oka let's wait closer to the day.

I recently see a story about how she met up with the first girl and was like all, 'Got to try out the new restaurant (with her)' something like that.

I mean I find it so weird she's not concerned that my friend (me) will feel bad?

Is my new friend being mean on purpose or just thoughtless?
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