TMZ posted a video this morning in which Seal said straight out said Heidi was screwing the bodyguard while they were together --- and that is why their marriage fell apart.
Heidi told one close friend today her relationship with the bodyguard was "strictly professional" while she was with Seal.
The friends tell us that since the split, Heidi says she has gotten "very close" to the bodyguard ... who has helped her through the difficulties of ending a marriage
As for the nature of their relationship now ... all the friend would say is it's "undefined." So that's what the kids are calling it these days.
Heidi's friend adds, "It’s sad but not surprising that he would resort to making excuses for their divorce when the real reason is looking him in the mirror."