Since her break up from Robert Pattinson it has been public knowledge that Kristen Stewart is struggling to cope with the split. It has been two months since the pair called time on their relationship and while the actor has moved on to Riley Keough, Stewart is still stuck on the British heartthrob.

According to Entertainmennt Wise, a source revealed to Star Magazine that the actress is trying to move on but Pattinson is still very much on her mind. The source said, "Kristen's been trying to have a good time, but it's difficult while Rob's on her mind."

"She can't be bothered to eat and the weight is dropping off her. She's not in the best place right now and saying she can't cope without Rob."

Source revealed that even during her trip to Nashville where Stewart got her first tattoo she could barely manage to smile.

"She put on a brave face and got her first tattoo while in Nashville to try to get into the spirit of the trip, but nothing seemed to cheer her up."

The actress has been surrounding herself with close friends while her ex has been surrounding himself with females.

Following their break up Pattinson had been spending his free time with their couple's mutual friend Katy Perry. However, it seems a new girl has caught his eye and has showed the actor that it can be fun moving on.

The "Twilight" star s rumored to be dating the late Elvis Presley's granddaughter and is enjoying the change view compared to his introverted and tomboyish ex.

"Rob is so happy that he can trust someone again because at the end of the day, Kristen's affair forever haunted him. In the back of his mind, he knew that she could be tempted again.

"He knows Riley isn't like that because she has other loves besides acting - acting doesn't define her and she is a complete package. [Rob] also likes that she is more lady-like, since Kristen is very tomboyish.

"It's very early, and they are having fun, but that's exactly what he needs. Rob is very happy with the way everything is turning out."

Do you think the stress of the break up with Robert Pattinson is getting to Kristen Stewart? Leave us a comment below.