You "fight for" a relationship by showing up emotionally, having vulnerable conversations, perhaps going to counseling, and otherwise doing things that men are way too often socialized against in order to figure out how to make it work. This is very literally the main point of this OP - something that seems lost on you. You read to respond, rather than to understand. Try taking a deep breath and actually reading what the author had to say without jumping to knee-jerk response.