It got so heated that we decided to cancel the field trip.
How was it cancelled?
The teacher cancelled it.
It is tough to cancel a trip that you are excited about, but if you feel you had a good reason to do so, then it's not a big deal.
I'm the one who's wrong for arguing, even though I had a good reason.
You can always make other plans to have fun. You can even make amends and come up with an acitivity to do together.