Is AUTHOR wrong in the post ? POST : For context I had an event all Friday and Saturday and before leaving I told my gf that I had loose plans to hang out with a friend Saturday night or sunday. Saturday night he said he could come over Sunday. This is between me and my gf sunday morning:

Gf: Wanna go somewhere with me this morning?

Gf: Upside I'll get to see you. Downside we're taking (her baby brother) to a play place. BUT he has always been really good there and always crashes right after

Gf: It would make me really happy! But if ur tired I understand

Me: I love you too and I would but (my friend) is coming over remember?

Me: Please don't be upset love, I really would and I'll be free after like 5-6 tonight!

Gf: Oh um no bc u never told me they were concrete. 

Gf: Who was all at (the event) with u?

Gf: And no it's fine. I'll see u Monday

Me: I'm sorry I just had so much going on I didnt even really think they were concrete until just before I passed out

Me: (names of 3 guys and 3 girls)

Gf: Ok

Me: I can tell you're upset so I'll leave you alone...

Gf: K