Selena, 22, and 20-year-old Justin dated for two years before their split in 2013 and their careers in the spotlight put the then-teenagers under huge pressure.
Speaking in a new interview, Selena says she has no regrets about her romance with the Canadian pop star, hinting that she learned a lot of lessons from their time together.
Selena tells V magazine: "When you're young and you're being told so many different things…it almost felt like all we had was each other, like the world was against us in a way.
"It was really weird but it was incredible. I would never take it back in a million years. You live and you learn, you know?"
The former Disney star then goes on to admit that she felt "a little depressed" following her split with Justin, adding that she found it difficult to leave the house and socialise.
"It was just easier to say, 'Hey, do you mind running to the grocery store and picking some stuff up? I don't want to get photographed," she adds.
Following months of speculation, Selena and Justin's relationship was confirmed in February 2011 when they attended a glitzy Vanity Fair Oscars party together.
The couple's fairytale romance saw fans branding them 'Jelena', however things came to a head in November 2012.
In January last year, Justin and Selena were spotted riding Segways together in Los Angeles, prompting whispers that they were set to reunite.
Soon after, Justin spoke out and called Selena his "elegant princess", which only added fuel to the fire, but it seems they were just happy being friends.
In November, Selena spoke out in a radio interview and insisted that she will always "support" Justin, who'd had a troublesome year.
The star explained: "I'm upset when he's upset. I'm happy when he's happy. I don't want anything ever to happen to him bad. It hurts me. That's all."
Since then, Selena has given another radio interview where she said she has "so much respect and love" for Justin". Quashing any reunion rumours, however, Selena added that she was "single".
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