It Wasn't Meant To Be This Way

I've been married for thirty years now. We have a great relationship, we support each other, laugh together, share all our problems and joys. But lately, something strange has been happening. At work, I met this woman in her mid-forties who's divorced. She's smart, funny, and when we're together, there's just this spark between us. It started off as lunch dates and coffee meet-ups, but it quickly escalated to drinks after work. We've talked about our fantasies and desires, things my wife and I haven't even touched in decades. One night, I found myself alone with her at a hotel bar. The conversation got heated, and the next thing I knew, we were kissing. She left shortly after, but it's been on my mind ever since. I love my wife deeply, yet there’s this pull to explore what life would be like without those thirty years of marriage behind us. It feels wrong, but also...right? Am I crazy? Is it normal to have these thoughts about someone else while being happily married? What should I do?