Are blood relations everything? in Thinking too much?

1:16am and I can’t sleep. My closest cousin was just discharged from hospital yesterday but that’s not the reason. She’s stopped sharing things with me and being someone who knows her darkest secrets, not being told the little things has left me thinking. For whoever’s reading, I might just sound like I’m overthinking it but I am sensitive and I’m not afraid to admit it. Her brothers getting engaged in a few days and ever since the date was decided, we were sure to dress up exactly the same. Just a few days left now and I find out from elsewhere she’s already prepared, twinning with her sister and sister-in-law whilst I’ve spent whole days looking for our outfits. I decided to ask her straight as I’m no kid to go crying to my mum but all I got was ‘Oh sorry, I forgot.’ That’s it. She left it at that. If it was a small thing, why is it making me share it? It’s a designer outfit her mum got from holiday and when I approached the Mum, all I got was a list of excuses. What harm would it have been if her Mum bought an extra outfit? Just because I’ve always craved for a sister she wants me to feel it more? Wishing the couple a blessed future but is it even worth being invited to this engagement? I’ve never understood why they say to never expect too much of a person but now it all makes sense. Do better for your own self, not to meet others expectation.