Personally, I think it’s important that she at least should have told him who she was going with, not to get his approval, but so that he’s in loop.
There are literally so many cheater stories in real life and in stories where they say they’re going on a business trip but actually are meeting other people, so at least be transparent asap to prevent any misunderstandings, which ML is alr seeing from the laptop

I dont understand why she should apologize when she's there for work? Thats toxic ,and going to where her work travel is just because he saw a new laptop ( ̄へ ̄)