A few things to consider/ensure before pulling the trigger.
Are you ok with this when it gets reversed?
W wants to take my the kids out of state (think airplane travel, resort, one full week away, etc). She doesn’t want me to come along.
Are your young kids (8,6,5) wanting to go on vacation without Mom?
Without some form of written agreement to such a vacation, trust becomes quite the issue. As in, if you don’t have a letter stating W understands and agrees that you are taking the kids for a week, and where you are taking them (especially different state or country), then some made up accusation from W could lead you into a whole lot of troubles. If she is on board with this, get a document from her.
D
Feelings are fleeting. Be better, not bitter. Love the person, forgive the sin.