The 89-year-old author walked out on her third husband, Nick Fox, after 26 years of marriage, accusing him of "coercive control and financial mismanagement".
The poet and jazz musician, who managed his wife's affairs, has written a series of poems about the split, saying he loved her for three decades and "Now he's just her cur, To be discarded cruelly on a whim".
The split emerged when Weldon wrote an email to friends and family, apologising for being "out of touch for a long time" and revealing that she had been in hospital for a large part of the last year.
"In the meanwhile, I have left my husband and am divorcing him, complaining of coercive control and financial mismanagement," she wrote.
Mr Fox, who acted as Weldon's manager and publicist, said he had always done his utmost to stand behind her so she could pursue her career as a "great writer" because "I was in love with her".
It can now be revealed that she left the marital home in December and is staying with her eldest son, Nic Weldon, in Northamptonshire.
Mr Weldon said she was too frail to discuss the split as she is recuperating from a stroke.
When she left hospital she moved in with her son and was "getting better", but had a stroke in June.