Well we all know that Taylor is disgusted by Justin.  Remember, this? And honesty, I can't say I blame her.  He has gotten himself in trouble time and time again, BUT it turns out there is more to this story as why Taylor is pissed at Selena. 

Sources confirm to Us Weekly that Taylor has distanced herself from Selena every since she and Justin rekindled their romance.  Let's remember how close these two were, Taylor tweeted in July that Selena was "the closest thing I've ever had to a sister." 

BUT it turns out that this recent fling with Justin isn't the only thing that is upsetting Taylor.  She believes Selena "used" a brief romance with Ed Sheeran last June to make her Justin jealous!!! 

"After Selena pulled that move, Taylor started distancing herself," a source tells Us. 

It makes TOTAL sense.  We haven't seen Selena and Taylor together in quite some time.  Taylor has been hanging w/ new BFF Lorde and Selena is well, with Justin (and rehab)!  Say what you want about Taylor, but she is a good egg.  Never parties, never gets in trouble, she know she is blessed and acts that way.  #TEAMTAYLOR