The actress recently apologised for having a fling with her Snow White and the Huntsman director Rupert Sanders.
"I am not sure they will be able to recover from this. He is heartbroken and angry," people.com quoted a source as saying.
"Kristen really loves Rob (Pattinson) more than anything. He is all that matters to her right now," added the source.
Another source said: "Rob is 'really depressed' and he does not know what to do. He doesn't know if he should forgive her or not. She's very angry at herself. She's really not blaming anyone but herself."
"Rob's whole experience of coming into fame was experienced with Kristen. This is going to be really tough. Nobody knows if they'll stay together at this point."
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