Guys, I am so angry is he still cheating?

I needed to get a number from my husbands phone so asked if I could go into his phone to look for it. I found the number of the woman he once cheated on me with STILL in his phone.
I confronted him and he says they don’t speak. Am I being stupid here? Why would he have that number if they don’t speak!!
Guys, I am so angry is he still cheating?
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