Friends behavior?

Hello, my friend wrote me to go together somewhere and I said yes as I have nothing to do and while we are chatting about it she suddenly said I think I'm not going anymore literally that came out of nowhere so I asked her why as we were really planning to have fun and basically she did not answer at all and it's been few days! I am not mad as she is just a normal friend but I just do not understand people anymore... At least say listen something came up or answer the question I do not need to know exactly why but at least out of respect and she was online all these days! This happened twice with her but like I just do not understand people anymore, was it because I was nice to her or something that people think they can just disrespect you?

Friends behavior?
Post Opinion