Is he cheating or was this just a coincidence?

Silvermantis
So I saw in my husbands phone contact, (his number) that there was another number saved along with his. We have iPhones. You have to type a number to put it there.
I asked why he had another number saved with his own number and he said he didn’t know. He acted all confused and like T-Mobile must had put it there by accident? We got the phones a year ago dude. I called the number in front of him and a girl picked up. I panicked and hung up but I texted it instead and she said she had no idea who we were and didn’t have our numbers at all.
I checked our phone bill and history and that number has never showed up. So I believed him. When I showed him the message she wrote I swear I saw a micro smile and then a few times after that. So THAT is what’s bothering me. I am really forgiving and it’s easy to trick me so I’m posting this here I guess to someone who isn’t as dumb as me. I know it’s only a small portion into the situation but is this a red flag or am I overthinking? It’s those micro smiles..
Is he cheating or was this just a coincidence?
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