The couple famously met on the set of the pop icon’s "Slumber Party" music video in 2016 but Asghari was initially hesitant to take on the role.
"I wanted to do TV, I wanted to do film," he told Forbes. "My acting strategy was kind of to go away from music videos. I didn't want to do more and be known as a music video actor, but a good friend of mine was working on a project and they referred me to the team that was picking out the leading role for 'Slumber Party.'"
"My girlfriend now at the time, personally she picked my picture and she wanted me to be cast in the music video," he explained. "My friend called me and said, 'I need you to be on it. Trust me, you want to show up.'"
However, at the time Asghari did not know who the music video was for but took his pal up on it.
"I showed up and everything just kicked off from there," he recalled.
The now-couple hit it off and began to date after the music video but after four years together, the 27-year-old seems happy to settle down.
"My priorities in life are to remain humble and understand where I came from and where I'm going," he said. "I want to take my career to the next step when it comes to acting. I want to take my relationship to the next step, as well. I don't mind becoming a father. I want to be a young dad."
"Now it’s important for people to understand that I have zero respect for someone trying to control our relationship and constantly throwing obstacles our way," Asghari shared on his Instagram Story last month after the release of Framing Britney Spears. "In my opinion Jamie is a total d*ck. I won’t be going into details because I’ve always respected our privacy but at the same time I didn’t come to this country to not be able to express my opinion and freedom."
A source told OK! the "Womanizer" singer's father "holds a grudge" and "isn’t the sort of man that forgives and forgets."
Spears is head over heels for the Iranian-born hunk too. His support "means everything to Britney, and she jots down sweet moments from their romance so she can go back and revisit them too," a source told OK!.
"Keeping a journal has been so cathartic for her. It helps Britney focus on the positive and feel more empowered and in control."
"Happy birthday to the man that always makes me laugh 😂🎉🎈!!!!!" Spears captioned a birthday post for Asghari earlier this week with a clip of the couple attempting to recreate the dance from "Toxic." "Who did it better ???? @samasghari."
Spears has two children Sean Preston, 15, and Jayden, 14, whom she shares with ex-husband Kevin Federline.