Friends cancelled after I already booked the flight

Problem/Goal: My friends convinced me to go on a trip with them but they cancelled after I already booked my own flight

Context: Two of my friends were planning to go on a domestic trip at ininvite ako. So that means it was all their idea. They scheduled the exact date and I kept asking for reassurance from them na matutuloy and they promised me na matutuloy sila. I had enough money to book for the flight na just a month before the trip and told them if it’s okay for me to book first since ayaw ko sila antayin because they couldn’t provide pa the exact date on when sila mag book which is baka mas mamahal pa yung ticket.

They said it was okay for me na mag book na and told me they were gonna do it about 3 weeks before the flight. So ayun, I booked my own ticket na since it’s cheaper if earlier mag book and even one of my friends were there while it happened so we were super excited na. Told them bawal na sila mag back out since I have a ticket na. Days passed and I kept reminding them to book their ticket until they weren’t able to fulfill the exact day/week that they promised me they would book the ticket. Our flight date was fast approaching and one of them said hindi daw sya papayagan ng bf niya lol. The other one didn’t have enough money but I can see she was trying because she kept sending me money ‘til it was enough to pay for the flight ticket para hindi niya magastos so ako pinahawak niya sa pera niya. 2 weeks nalang before our flight but she only saved up until ₱1.5k. That’s when I knew na hindi na talaga matutuloy. We don’t even have an accommodation yet.

I don’t know what to do. Should I cut them off or would that sound so petty? Is it my mistake for booking earlier than them just because it was cheaper? They really promised me naman na matutuloy sila and I was really convinced. I was only being invited and I was really excited about it pa naman. If I go solo, it would be really hard for me since wala akong kahati for the accommodation and other expenses. Also, my flight is non-refundable since my ticket is only Go Basic. It was worth not below than ₱5k :(

Previous attempt: I already talked to them and told them that I was disappointed, but I haven’t done it in a formal and confrontational way. I am closer to one of my two friends- which was the one who kept sending me money para hawakan ko yung money niya for the ticket. She asked for her money back since I told her not to go anymore after she told me she can only pay for her own ticket, not the accommodation. We haven’t talked for a few days now and our last conversation was her inviting me to go out and I refused— I told her in a not-so-serious way na hindi muna ako magpapakita sa kanila.