Why would he do this?

I caught my husband sending inappropriate texts to another woman. they indicated that they were having a physical affair but I have no proof of that but at the least it was a highly emotional affair (which I think is worse). This was all about a month ago. I checked his phone yesterday (he doesn’t know) and he kept her number! If it was ‘over’ like he says it is, why has he kept that link to her? Even IF they aren’t speaking right now has he kept it to co tinue speaking with her? I feel like she’s still in his life because he kept her number!
Why would he do this?
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