Ignore it. Be the perfect dad .... take care of the kids. She may be testing you to see if you can be trusted, or if you will have another affair.
Just work on being the best you, and don't focus on her behavior. She may be sitting innocently at a friends house chatting.
Let me ask you ... are you basing your imagination of what she may be doing until such a later time, on what you would be doing if you were out this late? Remember, she's not you.
Take care, and hope you have much resolution in your new year.
Me:57 H:52 M:28 Got another lawyer last year and filed. D35,S/D twins28,D22 EA4/04 End? Who knows? "Life is like a mirror. Smile at it and it smiles back at you." — Peace Pilgrim