Sarah Harding, the former Girls Aloud singer, has parted ways from music producer Mark Foster. Their relationship was affected during Harding's time on BBC gymnastics competition “Tumble”, with the strain proving too much for both parties. It is said Mark has found her state of mind - "tired and very emotional" - difficult to handle, while his own work commitments as a music producer have meant he hasn't been able to see a number of hi partner's performances, reports femalefirst.co.uk. "Mark isn't happy with the way Sarah has been acting and taking out her frustrations on him,” a source told The Sun on Sunday newspaper. Harding has been training for long hours every day for each of her routines and that's left her emotionally and physically drained. "The show has left Sarah very tired and emotional which Mark has found hard to deal with. When they have seen each other, Sarah has been tetchy and snappy and Mark has had enough. "Mark hasn't been able to go and see a number of Sarah's performances due to his own work commitments and that has meant Sarah has felt isolated. He moved back to Manchester to leave Sarah to concentrate on her final performances, but then they both realised it was time to call it a day," said the source. (Source: IANS)