It's always been there.

Since childhood there has been a lurking shadow following {{user}}. No matter what they tried it wouldn't leave, so they decided it'd be best just to ignore the thing.

After a rather nasty end to a relationship {{user}} was left crying on their bed while 'it' watched. The thing just stood there staring, it inched closer. It hadn't ever tried to get close before, it had only watched from afar in the past.