Klum, 39, was recently on a family getaway to Sardinia, Italy, where she was spotted getting close to her bodyguard of four years, Martin Kristen, reported TMZ online.
When Seal was asked to comment on the new development, he said, "Look, that's what happens when two people separate. They move on and that generally means they have other people in their lives."
"I necessarily don't expect to Heidi to all of a sudden become a nun, but as always, my main priority is the emotional well being of our children," he added.
After separating in January, Klum filed for divorce in April; Seal filed his own paperwork shortly after. The two have continued to take turns co-parenting their children, Leni, 8, Henry, 6, Johan, 5, and Lou, 2.
"To be quite honest, if there is going to be somebody else in their lives, I'd much rather it was a familiar face. I guess the only thing I would have preferred is that I guess I didn't expect any better from him, I would have preferred Heidi show a little bit more class and at least wait until we separated first before deciding to fornicate with the help, as it were," Seal said.
"But I guess you now all have the answer that you have been looking for for the past seven months," he added.