Darren Querns, from Glasgow, admitted physically and verbally abusing his victim between 2016 and 2023.
The 35-year-old admitted shouting, swearing, and pushing the woman as well as pinning her down and restraining her during arguments.
He also admitted checking her mobile phone and social media accounts and questioning her about who she had been in contact in a bid to control her.
On one occasion, Querns climbed the drainpipe at his victim’s home and watched her through her kitchen window before climbing back down after being seen.
During a separate incident, his victim was backed into a corner and pinned against a wall.
After she left the property, Querns slammed a window with such force that he caused it to smash.
In April 2022, during a stay at the Yotel Hotel in Glasgow, Querns began shouting and swearing at his victim before throwing items around the room.
Drinking glasses smashed onto the floor and bed with some of the shards striking the victim.
She suffered a cut to the back of the head, which had glass in it, along with other injuries.
After the relationship broke down, the victim’s mother received a Facebook message from Querns stating he had two recordings of her daughter in February 2023.
One of the clips contained audio of her the mother having a private phone conversation with her daughter, which took place when Querns was not present.
He went on to make several comments, referring to information that had not been disclosed to him and which had only been spoken about in the privacy of the woman’s home.
In July that same year, the victim went to plug a phone charger into a wall socket when she saw a static red light which she found unusual and had not seen before.
The following month, Querns contacted his victim and made a comment that indicated he had heard a private conversation she had recently had.
She immediately thought of the wall sockets and suspected her former partner was recording her conversations.
She unscrewed the wall socket in the living room and found a device which connected into the live mains and a contained a SIM card.
The victim found a further two devices in the property before contacting the police.
Officers discovered four devices installed in various wall sockets around the property.
The devices were activated if the sound went above a certain decibel level, if it received a text message or if it received a phone call.
DNA matching Querns was found on two of the devices. Officers found similar SIM cards at his home during a subsequent search.
On July 26, at the High Court in Glasgow, Querns pleaded guilty to two charges.
On September 5, at the High Court in Edinburgh, he was jailed for 27 months.
He will be supervised for 12 months following his release.
A non-harassment order, banning Querns from contacting or attempting to contact his victim, was also granted for an indefinite period.
Moira Orr, Moira Orr, who leads on homicide and major crime for the Crown Office and Procurator Fiscal Service, said:
“Darren Querns is a violent and controlling abuser who has inflicted unimaginable trauma.
“His calculating actions left his victim living in fear in her own home where she should have been safe.
“We hope this conviction brings some comfort to all those affected by his despicable behaviour.
“COPFS remains committed to prosecuting crimes of violence and domestic abuse, which are an unacceptable blight on our communities.
“I would encourage all victims or witnesses of similar offending to come forward, report their experiences and seek support.”