This excerpt comes from the novel Whiskey & Ribbons by Leesa Cross-SmithDalton had felt like it was him against the world for most of his life—before Penelope killed herself and especially after. I willingly took some of the load off him, willingly stepped into his pain to suffer alongside him. I wanted to be the kind of friend and brother who would lay down his life for his friends and Dalton did too. We were intentional with one another.
I've never seen intentional standing on its own when referring to people like this before. Shouldn't there be a noun or a verb somewhere, like an action or an event that happened intentionally? What does it mean when two people were being intentional with one another?