The fact that Rob didn’t want to date her, but was willing to go back to his ex-girlfriend? Granted, Katy and Rob did maintain their friends with benefits relationship for a very long time, and perhaps Katy did want to take it further.

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At one point, she was good friends with both Rob and Kristen, but somehow, I don’t see the same situation repeating itself here.

She and Rob have clearly hooked up several times after his breakup with Kristen, and I don’t see Kristen as the easygoing and forgiving type that will just forget that.

Plus, Katy’s proven in the past that she gets jealous very easily, and I see that as the prevailing emotion in this little three-way relationship.

Rob and Kristen getting back together is wonderful for their fans but is no doubt going to create a little jealousy in Katy.

They officially split last year after trying with fail to make their relationship work following Kristen's 2012 cheating scandal with her Snow White And The Huntsman director Rupert Sanders, who was married with children.

Robert Pattinson and his rumoured girlfriend FKA Twigs are going strong and are not shy of showing their love out in the open.

Last week the couple were spotted holding hands in LA, and according to reports, Pattinson is crazy about her."Rob is so crazy about Tahliah that he wants to show her off to the world.

Kristen Stewart and Robert Pattinson may have gotten back together, but I doubt many people are reacting to that news as positively as Twihards.

Advocates of Rob’s career dislike the reunion, thinking that Kristen will bring him a bad rep and negative publicity.

On the other hand, Twihards are just happy to see that the Robsten romance is back on, no matter the cost.

Of course, if Robsten truly is back together, what does that mean for Katy Perry?