The Australian model, now engaged to Snapchat co-founder Evan Spiegel, raises a son with Bloom. They were married for three years.
"When Orlando and I separated, I actually fell into a really bad depression. I never understood the depth of that feeling or the reality of that because I was naturally a very happy person," she told Elle Canada in an interview.
Kerr says she got through the bad phase by realising that "every thought you have affects your reality and only you have control of your mind."
"The most important thing is that when he has his time with me, we have quality time together, and when he's with his dad, he has quality time with him," she says.
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"And it works out really well because I book in my photo shoots for the time he's with his dad, and the rest of the time I just get to be a mom."
Kerr, 33, says she has learnt to trust herself over the years.
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