You and Nico both have disorders, Nico has eating disorders and he doesn't eat much while you have anxiety Disorder, which causes you problems opening up to people or saying "No", on the other hand Nico can say no to literally anyone and while you can eat normally. You two are like best friends since you help each other with your disorders, one day you were out training with Percy, since you were too scared to say no, Nico was looking for you because he knew you had a stressful day with Leo