She wanted to help other women avoid the same pain she felt, so she started working for a company called Lazo, which describes itself as a "tool designed to see intentions and let go of toxic relationships."
Now she is paid to conduct dozens of loyalty tests a month on people suspected of cheating on their partners.
"I've seen some comments saying it's stupid," she said - but she doesn't feel bad about what she's doing. "If you can't be loyal, then you shouldn't be in that relationship," says the girl.
Once she accepts an "assignment," Savanna Harrison texts her client's partner, following the tips and instructions of the suspicious client."
He'll give me details about where he wants me to go with a conversation," Savanna said.
She'll find out where her boyfriend hangs out and start a conversation, saying she saw him at his favorite bar or pretending to accidentally send him direct messages and photos.
"Anyway, I'm going to go into [his direct messages] and say something to see if he responds in kind."
Throughout the process, Savanna updates her client by sending her screenshots of any conversations between her and her boyfriend.
A loyalty test can last around five days, with screeners like Savanna going so far as to arrange meetings with the target to which they will not show up.
In a recent test, Savanna was asked to "set up a date... until you go there." He was then told to cancel the meeting so his girlfriend could show up in his place.
According to a relationship expert, a loyalty test is not a healthy way to build trust in your relationship. "It would be much better to talk about why they feel insecure in the relationship," said Marian O'Connor, consultant couples and psychosexual therapist at Tavistock Relationships.
"It's about saying, 'Is there something wrong with us, what's going on?' That's the important thing, don't surprise them." She also recommends thinking about why you don't trust your partner and if there's something deeper going on.
“Is this the experience you've had in all relationships? Is this lack of trust something that comes from childhood, or is it in this particular relationship?” Loyalty testing company Lazo says it's not trying to catch people off guard.
"There might be this misconception that we're here to trap people," says Ashlyn Nakasu, community manager at Lazo.
"That's really not the case," she says. She says all the company does is help people confirm what they already suspect — that their relationship is ending.
"[Often] they just need that proof, that last kick in the ass to say, 'He's not the right person for you,'" she said.
“We always tell people that the best first choice is to communicate with their partner. And if there's no communication, then you can try to have a loyalty test if you really think something's wrong."
So how much does it cost the loiality test?
The tests usually cost between $50 and $80 (£37.50 and £60), but the price varies from one tester to another, with some asking more than $100 (£75) for their services.
"I don't care about money," Savanna says. "I'm more interested in helping other girls because I've been through it myself." Lazo has only one full-time controller, who earns about $3,000 a month doing loyalty tests, but there are 350-400 part-time controllers like Savanna on their records. They're a new company — Lazo fully launched in January — but loyalty tests aren't a new concept.
The hashtag "#loyalty test" already had millions of views on TikTok before Lazo was launched, with suspicious partners often finding strangers on the internet and asking them to test their partners.
Lazo, Ms. Nakasu says, has only created "a database of people who are willing to help, who know exactly what to do, and who know exactly what people are asking for."
