Most Helpful Guy
You can do two things:
1. Since he is your ex now and you don't have any feelings for him and if you don't care about the money being refunded then don't go to the trip.
2. You can think of your ex as a friend and go to the trip enjoy yourself.0
Most Helpful Girl
I would go on the trip especially after paying for it he comes he comes if not that's probably even better.0