The word "over" has many meanings but I can not understand what is the meaning of "over" here:
I will not allow you to leave school over this.
I think I don't get the sentence's structure correctly.
The full text is here:
He sighed and looked heavenward. “How much will it cost to fix the tooth?” “Fourteen hundred,” I said. “I’ll find the money.” “The church will pay,” he said quietly. “I have a discretionary fund.” “That money is sacred.” The bishop threw his hands in the air. We sat in silence, then he opened his desk drawer and withdrew a checkbook. I looked at the heading. It was for his personal account. He filled out a check, to me, for fifteen hundred dollars. “I will not allow you to leave school over this,” he said. The check was in my hand. I was so tempted, the pain in my jaw so savage, that I must have held it for ten seconds before passing it back.
Educated by Tarawestover