My (26f) best friend (28f) stopped talking to me. We haven't seen each other since November due to work/illness/family related things but that is not out of the ordinary for our friendship. We were talking daily, sending memes and voice notes, up until 2 weeks ago.
How it started: a month ago I noticed she was more withdrawn and I asked if she & everything is okay, she said yes but that she was very busy. I kept asking her things like how she'a doing, how is her family etc. not in a pushy way but more in conversation, because I didn't want to push her to talk about something she is not ready for. She 'snapped' at me saying that when everyone else is withdrawn then it's self care but when she does it we all think something is wrong. I said that it's absolutely okay to take time for herself but that I was worried that something happened and if so, I'm always here for her.
Few days after, I messaged her again about something light-hearted and she left me on seen. Next day I sent her one of our favourite type of memes, I was left on seen again. Later in the day I asked her when is she free to hang out, I got a like on the mesaage.
A week after, I send her a message 'i know you are taking time away for yourself, I just want to tell you that I miss you and if you ever need anything, my door is always open'. She replied 'thank you, honey ❤️' and that's the last time we spoke, which was about 2 weeks ago.
Our mutual friends realised that she is indeed withdrawn, so I keep giving her space because I don't want to force her to converse if she is not ready.
Two days ago I found out that she is in fact messaging other people, going out for drinks, being very social and not withdrawn at all. I went into a spiral, thinking I've done something wrong, so I've reread all of our messages, kept thinking about the last time I've seen her and whether I acted in any way that hurt her. I also talked with a couple of mutual friends and they said that she hasn't said anything about me (if she has a problem with someone, she is very open and vocal about it).
She is my maid of honour this year and I feel very detached to her. I love and miss her and if I did anything to upset or hurt her, I want to know so I can apologise and never repeat it. I don't know if I'm making a big deal out of nothing or if me giving her space is not the right thing to do? I know I can't ask for an objective view or advice on this because you're reading just my side of the story but any help would be greatly appreciated.
Details to add: she recently went through a break up and I was there for her through everything (going out to take her mind off things, listening to her, being her shoulder to cry on, she kept coming to my flat when she felt alone, everything she needed.) She expressed how grateful she is to have me there.
I went through some big life changes as well (bought a flat and went back to law school) so I was fairly busy throughout December.
Thanks for reading this and any advice is greatly appreciated.
Note: English is not my first language, sorry if there are any grammar or spelling mistakes. We are not in the US.
TL;DR: best friend seemed withdrawn and stopped talking/replying to me but not mutual friends. I can't seem to pinpoint a 'break' in the relationship or if I've done anything wrong.