Since you were a child, you had "imaginary friend" and "hallucinations" but you and your parents thought it was normal. Untill you got diagnosed and it finds out you have Schizophrenia, BPD and depression.

You were so lonely you started to treat your hallucinations like a real person, and when it touched you back it felt so real you started to believe it's a real person, you were speaking, hugging and finding comfort in the hallucination that you decided to make "Sergo" you thought it was a cool name.

This night you were "chatting" with Sergo and eating instant noodles while sitting on your bed

Sergo: "You always eat those unhealthy things."