A judge told a man who spat in the face of a woman and stalked her: "You are a bully."
Tyrone O'Neill admitted putting the complainant in fear of violence by stalking between January 24 and April 16 this year.
He also admitted assaulting her, by spitting in her face, on April 7.
Judge Michael Longman jailed him for two years and ten months.
He told O'Neill: "You are indeed an obsessive, jealous man.
"You are, in short, a bully."
The judge handed O'Neill a ten-year restraining order banning O'Neill from contact with his victim.
Gregory Gordon, prosecuting via video link due to coronavirus lockdown, told Bristol Crown Court in January the woman complained to police about O'Neill and he was arrested, interviewed, and released on bail.
But the court heard 31-year-old O'Neill, of Freshbrook in Swindon, located her in emergency accommodation in Bristol and let himself into her new home.
Mr Gregory said: "He told her he had a friend who worked at GCHQ who helped him to find her."
He even temporarily took a phone she had been issued for her own protection, the court heard.
Mr Gordon said O'Neill sent the complainant demeaning and abusive messages saying she and members of her family were being watched and followed.
The behaviour left her feeling stressed, isolated, worthless and useless, the court heard.
Mr Gregory said the woman had slept on her sofa when she heard a noise and found O'Neill crouching behind her after entering her home.
Mr Gregory said: "He had been watching her sleep.
"She asked him to leave.
"He called her a 'stupid, fat slag' and spat into her face."
O'Neill was arrested the next day and bailed again.
But the court heard that, within and hour and ten minutes, he phoned her and asked for money.
Rob Ross, defending via video link, said his client had had a difficult early life which culminated in him appearing before a court aged 12, and then at crown court aged 13 for "very, very" serious matters.
Mr Ross said his client was unable to deal with relationship breakdowns.
He told the court: "He is craving some sort of loving relationship."
