I have been friends with another mom (H) in my neighborhood for about 3.5 years. When I first met H she told me she had a fight with one of her close friends and she didn’t talk to her for months, but they’re fine now. I just noted that in my head. Fast forward to last summer, and another mom (L) in our friend group invites us all to a get together. I accept and one of the other moms accepts. H declines because she had some small miscommunications/issues with L. As H is telling me that she’s not going, she says to me “remember, you’re MY bestie”. This statement surprised me and I laughed it off. First, I never felt the need to put a best friend title on our relationship, but we were definitely close. Second, L is not a threat! L never knew that H disliked her so much. And H would not try to work it out with her even though I tried to get her to. I continued my friendship with L because I enjoy her and our daughters are in the same class. Then everything blew up because, at the beginning of an outdoor neighborhood party, H walked into my house without knocking (while I was still getting dressed) to say “why didn’t you even give me a heads up that L was going to be here” with a look on her face like I betrayed her. I was pretty upset. I’m not in charge of this party. Second, L has been at these events before (she doesn’t live on our street but is in our neighborhood). Third, I wasn’t even sure if she was coming or not. I told H I can’t talk about this right now. H had been “off” for a few weeks and I wondered if she was mad at me for something. I talked to her after the event and she told me she has been upset for weeks. Backstory: L has a Halloween party that a group of us mom friends have gone to for the last 2 years. H was invited of course but she declined the invitation. I tried to convince her to go but she wouldn’t budge and seemed dismissive of it. I wasn’t going to not go just because H wasn’t going, so I accepted the invitation. So now I'm finding out that H was upset with me because I didn’t ask her if she was sad about the party or express that I was sad she wasn’t going. But I DID tell her I was sad when she first told me she wouldn’t go to it this year, months before. I tried to get her to change her mind. And she never told me she was sad about not going! I tried to not bring up the party to her at all because I wasn’t trying to rub it in that I’m going. I question myself all the time, but to me, we’re all adults and this isn’t middle school. I can have other friends. I was never mean or excluded H from something I did with L. Was I somehow not being a good friend to H??