What should I do if I feel my loneliest when I have the most contact with my friends and bf?

I was away in Europe for a while and had minimal contact with most people, and 0 physical contact with any of my friends at home of course. I saw a handful of friends here and there in Europe from Europe. But that is all.

I’ve been back for a week and I feel soul-crushingly lonely despite having plans every day. I also just got reminded that one of my groups of friends has a girls group chat without me (and maybe more ?) which didnf help my feelings.

My bf is also currently abroad for a month and I waited to see if he’d reach out today if I didn’t and he hasn’t.

My best friend and I also have plans to see each other next week since she is tired this week but I feel so lonely and actually feel like I really need her company rn, even a bit more messaging :(

I just feel so empty suddenly, I wasn’t expecting this… what to do?