A Little White Lie to Go Out with Friends

So I know this isn't exactly the usual kind of thing people write about here, but it's been gnawing at me for days and I feel like I need to get it off my chest. It was just a tiny fib really... or maybe more like bending the truth slightly. My wife is super understanding most times, but sometimes she gets a little overprotective when we haven't seen each other in a few weeks because of work shifts. She asked me on Wednesday if I'd be free to go out for dinner this Saturday evening and I sort of... hedged my answer. I said something vague like 'maybe,' which in her mind means 'no.' I didn't mention that I already planned a casual meetup with friends from college at a new bar downtown Friday night because, you know, she'd probably insist on coming too or try to tag along for moral support. It's kind of silly how stressed out I've gotten over it... I shouldn't have felt guilty about going out without her. She doesn't even mind us catching up with friends when we make time in advance. But now I'm worried that she'll find out and think I don't trust her enough to be honest about my plans... or worse, wonder if there's more to it than just a casual night out. Silly me, right? Oh well, at least I had some fun last Friday!