Maybe I'm being silly, I think I probably am.
Basically I got a text from a friend asking why I had not got back to the bridesmaid about the hen do. It wasn't a nasty text, more of a friendly reminder.
I was a little 
because I'd never been told about the hen do aside from a brief conversation with the bride of "I'd like for us to go out for a meal and cocktails etc most likely on this weekend"
I'd never got a text/email or even FB message saying exactly what the plan was or dates or costs or who I needed to tell that I could attend.
I obviously told the bride this and she said that a group text had gone out by her bridesmaid, and that the bridesmaid said she had definitely sent it to me but she would get her to send it again.
No problem with this as the bride had just assumed that I had received it.
The bridesmaid who is actually a mutual friend (and we used to be very close friends up until a couple of months ago) then sends me the text.
No apology or anything for not sending it to me in the first place.
I don't mean apology as in grovel and beg my forgiveness. I mean just a -
"Hi, really sorry that you didn't receive this text the first time round, not sure what happened there"
But there was just no acknowledgement at all.
(There is a small part of me that does believe she might have left me off on purpose but obviously I can't say or prove that but I believe this might be clouding my judgement)
Would you expect an apology or at least acknowledgement?