Friar Lawrence's interactions in Shakespeare's "Romeo and Juliet" significantly contribute to the development of the conflict. His well-intentioned but misguided decisions, such as marrying Romeo and Juliet in secret and concocting the plan involving the sleeping potion, create a chain of events that ultimately leads to the tragedy of the young lovers. His actions, though meant to resolve the conflict, end up exacerbating it and driving the narrative towards its tragic conclusion.