Please help husband kept her number?

Hi all, please don’t judge me for staying, we have two very young kids so please don’t say ‘just leave’.

I found out last year that my husband had been messaging some girl. I don’t know if it was ever physical but judging my the texts I think it was. He said it was over between them and I assumed that he had deleted her number. He hasn’t. I’ve just found out it’s still in his phone. Not blocked, or deleted. Why would he keep her number if it was over? If it was a case that he was scared of her saying/doing something wouldn’t he change his number or something? Because that is the only reason I can think that he’d keep it.
Please help husband kept her number?
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