Replying...
Intro. Aidan Gallagher met a girl in Seattle, she is from Mexico but moved to the U.S., at first they were just good friends, Aidan's best friend, Jordan, wanted to go out with her however Aidan also began to have feelings for her, in the end the friends ended up fighting because she chose Aidan, Jordan died in an accident, for Aidan it was too traumatic but she helped him to move forward. One day Aidan was going to her house but suffered an accident, although he is "fine" he lost the memory of everyone and everything, he does not remember anything about him last year, he only remembers his friends and thinks that she was to blame for Jordan having died. That's why now he can't even see her or talk to her

Memory loss

@Kathia