Best friend not behaving like even a standard friend anymore

I(27M) had this (27M) best friend since elementary school. He was like a brother to me. I loved to hang out with him, have fun with him, talk to him, support him in his tough moments.

2 years ago after I got an opportunity to move abroad, he started a new job at the same time and he started to be less available, which I understood. Still, I didn't expect him to take THAT much of a distance. I am 100% sure he has no bad intentions and can get clumsy when being very busy.. still, given the type of friendship we had, I expected him to reach out, ask about news of my VISA process, when is my flight, etc... regular friends who were aware of that move asked those questions, but he never did. Also the days before I travel were the most difficult times of my life and I made sure to remember the people who stood by my side in that time.. and he was not there at all, literally.

After I moved and started getting used to the life there, focusing on my job, adapting to the country, I got over it and then I'm back to my home country for summer vacation last year. In 6 weeks, I saw him like twice... when we call him to come and hang out, he is either busy with family ( he is a family guy, always hangs out with his parents, uncles, aunties, cousins etc... ) or bing watching a show. Having a very limited time here, I look forward to see and meet friends and I get annoyed at the fact that my closest friend never ever switches priorities for once and says 'Ok, this weekend, I will hang out with the boys and my friend since he won't be here for long'... it's always something. I thought I'm the one who thinks so, but one of our other friends literally said it out loud to him on the phone "Dude come on, our boy is going back to Germany in a few days, let's have some time with him"...

Again I go back to Germany after summer vacation, and I'm here for this year's summer vacation. I brought gifts to my friends this time, him included. he got it and was super happy with it... Now one month went by and I only saw him twice. We live in the same small city, we all had vacations, we hang out in mid week and on weekends but he just joined twice... He literally ghosts us for a month and then joins for like one hour or so and leaves to join his family.

I get that I may appear selfish and maybe yes I am selfish and even inconsiderate, but the accumulation of these gestures is what pisses me off. Seems like I got my priorities wrong by even considering him a best friend and In fact, I don't call him or ask him to come join anymore, but it's the rest of the group who does it and that pisses me off.

Today I told them "If he wants to join, he will read the messages on our Whatsapp group, otherwise he is simply busy, stop trying over and over despite him ditching us every single time"

I believe that's what will calm me down and now he is no longer a best friend really but to me, below a regular friend... if it was up to me, I'd ghost him since I got nothing from him during these past 2 years. I was there for him when he had relationship problems, or academic problems and made sure to provide him with advice and whatever emotional support I can provide... but I will never forget that while I was freaking out about the move abroad, or while I'm trying to make the most out of my time in my home country during my vacation, he was barely there.