Caught Up in a Secret Student Attraction

I've been teaching at the same university for over two decades now. I'm married to my high school sweetheart and we have a great life together, two kids, nice home, successful careers. But there's something that's been gnawing at me lately, something I never imagined happening. It started about six months ago when a new student joined one of my classes. She was around twenty-five, an older grad student with this incredible confidence and charisma. It wasn't just her intellect either, she had a presence in the room that would draw everyone's eyes to her whenever she spoke. We started meeting for office hours more frequently than any other student ever has. She would come by with questions about assignments but often, we'd find ourselves talking about everything else under the sun, her plans after graduation, my travel experiences from when I was younger. Each conversation felt like a chance to get closer to her. Then one day, as she sat across from me in my office, something changed. Our eyes locked and it felt like electricity crackled between us. She leaned in close and whispered about the spark we both clearly saw too. It wasn't just curiosity, it was desire, undeniable and terrifying at the same time. We agreed to a dinner that night, keeping our hands on professional lines but each moment together set off alarm bells. We shouldn’t even be talking like this, let alone considering anything more, but there it was anyway, temptation rearing its head. Over dessert, she confessed her feelings too and we found ourselves making vague plans for the future. Since then, every interaction carries that weight of possibility and guilt. I know my marriage is based on trust, but how do you reconcile this feeling with the life I’ve built? My husband would be devastated if he knew, yet a part of me wonders what it would feel like to act on these forbidden desires. Is there something fundamentally wrong about feeling this way towards someone much younger who isn’t even a colleague? Am I the asshole here for being so torn and considering anything further with her?