Trip Extension, kind of sad (F21, M21)

Hey guys! I need advice on how to cope with my bf extending his trip an extra week to be with friends 🥲

For context, my bf and I are in a normal relationship and technically live together in his family’s apartment. Since feb 22 we’ve been LDR with a 16 hour time difference. He was supposed to be back by Mar 31, but he and his mom decided to extend their stay until April 8. I know that when he’s here, we’re always tgt and in the grand scheme of things, one month is relatively short. I just can’t help but feel so sad and almost angry that he’s extending his trip all of a sudden, but I also feel guilty because I don’t want to be selfish. I want him to enjoy the trip, and that’s why I’m not projecting my sadness onto him. I feel like I’m back to square 1 of waiting for hjm to come home, it was supposed to be 25 days until I see him again and now it’s back to 34 days. I need tips on how to cope, and reassurance that what I’m doing is right… do you guys think 34 days is long:(