💌 My best friend did not invite me to her wedding and I still do not know why

Found out through a mutual friend's social media post that my closest friend of nearly ten years got married last month in a small, apparently fairly intimate ceremony that I was genuinely not invited to attend, not even informed about happening at all until well after the actual event had already taken place and passed. We had drifted slightly over the past year, mostly due to her being busy with wedding planning itself and general life changes on her end, but nothing that felt like an actual falling out or any kind of real, specific conflict between the two of us that I was consciously aware of at the time it was apparently happening. Messaged her directly asking, as gently as I genuinely could manage, why I was not included, and her response was fairly vague, something about keeping the guest list genuinely small and only including immediate family plus a handful of very close friends specifically, which stings considerably given that I genuinely thought I qualified clearly as one of those close friends myself after everything we have actually shared together over the years. She has not offered any further explanation beyond that fairly brief initial response, and I genuinely do not want to keep pushing directly for more specific detail if she is not actually willing to offer it herself voluntarily, though the whole situation has left me second guessing the actual strength and depth of a friendship I had previously considered one of the most solid and reliable ones in my entire adult life up to this point. We still talk occasionally now, but there is a real, noticeable distance that has crept in since I found out about the wedding this way, one that I honestly do not know how to actually bridge without a fuller, more honest explanation from her side of things eventually. Has anyone else been excluded from something significant like this by a genuinely close friend without ever getting a real, satisfying explanation, and did the friendship eventually recover in any meaningful way, or does something like this usually just quietly end things for good?