"It's intolerable, it's very hard, as everybody must realise, especially if it happened to them too, and what else do you do, you get on with it," Bob told ITV's 'Lorraine Live.
Peaches, who was married to musician Thomas Cohen and had two children -- Astala, 2, and Phaedra, 14 months, was found dead at home in April this year of a suspected drug overdose.
Bob said they were reminded of Peaches everyday.
"You could be talking to somebody, you could be walking down the road, and I've got to be very careful because this is still very raw... But I'm walking down the road and suddenly out of the blue there's an awareness of, her... And you know, I buckle," he said.