"I fell just as hard for her as I had the older man [someone she previously dated] so many years before," she explained.
"It was that same familiar force of nature; I didn’t have to think about a thing or overanalyse. It just happened and it felt exactly right. Reflecting back on our three-year friendship, I realised I'd always been drawn to her in a way I wasn't with other friends, but until that trip it had never crossed my mind to think of her in a romantic sense."
The A-list duo called it quits in September but Carter doesn't regret a thing, as she's thankful that the experience enabled her to grow as a person.
"While it was short-lived, I'll remain eternally grateful to my most recent relationship for opening my eyes to this unexplored part of myself, and for inspiring a new level of self-discovery and wonder at all the possibilities of life," she continued.
"I've been forced to get to know myself in a far deeper way than ever before, and not just in terms of my sexual preferences. I've also been forced to reckon with who I am as a person."
The 31-year-old also revealed that the overwhelming media coverage pressured her into believing that she needs to put a label on her sexuality with headlines downplaying their romance.
"Although the relationship with my friend was often referenced in the media as merely a 'summer fling' or a 'same-sex affair', it was so much more than that. This was a profound journey of self-discovery," she wrote.
"For the first time, I listened to myself, forgot about the 'norm', and lived. I hope that everyone, when given the chance, takes the time to understand who exactly their most authentic selves are, untethered from what we may have been taught to believe. Remain curious. Know that there are many layers within you - and they just might be the most invaluable ones."
Two weeks after their highly-publicised split, Cyrus was spotted kissing singer Cody Simpson and the pair - who have been friends for several years - soon moved in together.
Their newfound romance sparked backlash online after the couple began to document their adventures together on social media from kissing over açaí bowls to getting matching tattoos.
In sharp defence of their relationship, the 26-year-old songstress penned a powerful statement on Instagram Stories.
"Men (especially successful ones) are rarely slut shamed," Cyrus wrote. "They move on from one beautiful young woman to the next most times without consequence. Where women are called sluts/whores! I am trying to just thrive/survive in a 'man's world'."