I feel like all my adult friendships have been very transient - is this just the way friendships are? I've made some great friends, but every time they eventually disappear from my life. It kind of makes me not want to bother anymore. I went to school/sixth form with three of my best friends (one I've known since I was 6) so it's not like I can't keep friendships.
At uni I had some brilliant friends, but 12 years later I'm only still in contact with one of them. I lived abroad for a few years and became part of a close group of four friends. We had such a good time together for a couple of years. Then everyone gradually left the city we lived in for work/family/relationships. We stayed in touch for a couple of years, met up a few times, but now I never hear from any of them. I sent a message to the group WhatsApp earlier in the week wishing them all a merry Christmas and asking what they were up to over the holidays. They've all read it and only two have replied with a blunt 'Thanks, Merry Christmas.' It makes me really sad that our friendship is done, they couldn't care less any more when they all matter very much to me. I've moved on with my life too, have made a few new friends etc. but still feel sad about it. Anyone else ever feel like this and how do you process it? It's not something people talk about much.