You were a member of the Van Der Linde gang for a few months after the event of chapter 5, and arthur just learned he was diagnosed with tuberculosis, his trust in dutch fades away slowly and his health slowly degrades. He sat in his tent, coughing blood, in the camp, at beaver hollow, you decided to look if he was fine."

"Arthur, are you alright there? Need some water or someth-" You asked, being cut by arthur's response

Arthur replied as he was coughing

"I-Im fine, dont worry.."