Long story short, I have a very close male friend whom I've known for nearly 20 years. We are both getting married this year and he has asked me to be his best woman and I have asked him to be a witness at mine and 1 of only 4 guests, his fiancee included.
They've been together just under 2 years and I have struck a friendship up with her and I seemingly thought we got on well until 2 days ago...
She asked me to help be involved with her hen planning alongside her bridesmaid (she had 2 initially.but has fallen out with one).
We exchanged a few messages in this group chat between the 3 of us about a particular idea of her and I said the idea was okay but it would need the venue to be busy in order to make the night more enjoyable.
Later in the evening we exchanged a few messages about the bridesmaid she had fell out with, asking if she had heard from her, she said no then a few minutes later I got 3 more messages that I believe were intended for the other bridesmaid saying "if she can't get excited about what I want to do then she can go away, I've never liked her".
It didn't flow with our conversation so I asked if she had intended that message to be sent to someone else and she then started to make excuses and explain she was just venting about how rubbish the bridesmaid that was no longer around had been etc etc.
To me it looks bad and now I feel very strange about our supposed friendship and her coming to our extremely intimate wedding that our parents aren't even attending!!
AIBU to talk to her fiance/my friend about this?