How do I explain to my kids mommy isn't coming home?

My wife cheated and walked out on me and the kids. She told me it's better if the kids stay with me. My kids are 4, 5, and 7. The two younger ones are having a hard time understanding mommy isn't coming back. Breaking up is hard enough, but I feel like I have to put my emotions in check.
How do I explain to my kids mommy isn't coming home?
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