Seal has reportedly accused his supermodel ex-wife of cheating on him while they were still married.
The Kiss From A Rose singer made the allegations after 39-year-old Heidi Klum and her bodyguard Martin Kristen were spotted on a getaway in Sardinia, Italy.
Seal claims the two embarked on a new relationship before he split with Klum in January.
The supermodel has reportedly told friends her new beau had become her "number one confidante" after her highly publicised split.
A source told People magazine: "It's complicated. Their relationship is hard to define.
"This has been a difficult time. Her inner circle of people she trusts is getting smaller and smaller and he is her number one confidante."
Heidi and Seal announced the end of their marriage in January after seven years together and she has previously said she was enjoying life as a single woman and didnt have any plans to marry again.
She said: "I don't know if I'll get married again. Although I really enjoyed being married. I'm a dreamer. I loved our annual fairy tale weddings that were our big family parties. But sadly, it somehow didn't work out.
"I think everyone should work on their dreams. I try to. I look into the future, concentrate on my family and I have to say that I'm happy," said Klum.
"There are worse things in life than a separation."