It鈥檚 been a weekend for Katy Perry. While live streaming her entire weekend, the singer went on an emotional roller coaster, talking about everything from her identity struggles to her cultural appropriation. When the weekend turned to her on-again feud with Taylor Swift, the singer made an apology of sorts to her former BFF.

While Swift has yet to comment, it鈥檚 time we took a trip down memory lane to see how the two mega stars have gone from squad to squabbles, in case there could be any kind of reconciliation.

2008-2009: The earliest days of Perry and Swift鈥檚 friendship saw the two meeting and hanging out at post-awards shows parties. As time went on, they released new music and fawned over each other publicly on Twitter. It was during these early days that Perry was still married to now-ex husband Russell Brand. (Photo via Larry Busacca/Getty)

November 2009-February 2010: During Perry and Swift鈥檚 budding friendship, Swift briefly dates fellow musician John Mayer. The couple split in February 2010, and Swift eventually goes on to write music about her former (much older) boyfriend by way of her hit, 鈥淒ear John.鈥

April 2010: With their friendship firmly cemented, the pair took to the stage together during Swift鈥檚 tour to perform Perry鈥檚 hit 鈥淗ot 鈥榥鈥 Cold.鈥 What better way to profess your undying friend-love by covering one of their most popular songs?

November 2011: The pair send adoring tweets back and forth after Swift announces the arrival of her new cat, Meredith Grey. Both singers consider themselves to be 鈥渃at ladies,鈥 and the friends gushing over a new kitten is wholesome.

July 2012: Perry鈥檚 husband, Russell Brand, tells her he is divorcing her via text message (which we see in all its heartbreaking glory during her docu-concert movie, All of Me. Brand admitted toBillboard Magazine that their short (less than two-year) marriage ended, in large part due to their conflicting schedules. (Photo via Larry Busacca/Getty)

August 2012: Scandal! Swift鈥檚 former boyfriend Mayer and BFF Perry start dating, although Swift seems okay with it, as the couple were spotted at the 2013 Grammy Awards and Swift and Perry had a friendly hello. (Photo via Christopher Polk/Getty)

September 20123:TMZ聽reports that the singers have have had a falling out due to Perry stealing three of Swift鈥檚 tour dancers after the dancers gave Swift 30 days notice in the middle of her tour.

October 2014: This is when it all falls apart. The release of Swift鈥檚 multi-platinum album 1989 sees hit single 鈥淏ad Blood鈥 climb the charts. With lyrics like, 鈥淵ou know it used to be mad love/So take a look what you鈥檝e done/鈥機ause baby, now we鈥檝e got bad blood,鈥 had everyone wondering who the song was about. In an interview with Rolling Stone Magazine, Swift said, 鈥淔or years, I was never sure if we were friends or not. She would come up to me at awards shows and say something and walk away, and I would think, 鈥楢re we friends, or did she just give me the harshest insult of my life?'鈥

In response, Perry subtweeted, simply saying, 鈥淟ook out for a Regina George in sheep鈥檚 clothing.鈥 Even fans noticed that Swift was putting Perry on blast in the liner book for the album.

Summer 2015: Nicki Minaj adds fuel to the fire. After tweeting that it seems as if MTV will only nominate 鈥渟lim women鈥 for awards, Swift responded by saying, 鈥淚t鈥檚 not like you to pit women against women, maybe one of the men took your spot.鈥 Not to be outdone, Perry chimed in on the social platform, saying, 鈥淔inding it ironic to parade the pit women against other women argument about as one unmeasurably capitalizes on the take down of a woman鈥︹ (Photo via Larry Busacca/Getty)

May 2017: After a few random cutting tweets and comments regarding Swift, including Perry鈥檚 insistence that she鈥檇 consider working with the singer if she apologized to Perry, Perry releases the Taylor Swift diss track, 鈥淪wish Swish,鈥 and although she claims it鈥檚 not about anyone in particular, to most people, it鈥檚 pretty clear that the song is about Swift. Perry even (sort of) admitted it on Carpool Karaoke.

June 2017: In a stroke of pure genius, it appears that Swift has gotten the last word (for now). When Perry released her new album, 鈥淲itness,鈥 on June 9, that very same day Swift casually re-added her entire back catalog to streaming services after she鈥檇 pulled it three years prior. Shady.

Time will tell if the pair will ever truly get over their seemingly petty disagreements, but one thing鈥檚 for sure: In the nine years since the two first met, they鈥檝e given us a lot of entertainment.

Have you ever had a major friend fallout? Tell us how it ended @BritandCo!