Lost in My Fantasies Again

I've been struggling lately with these intense fantasies that consume me. It's like I'm locked inside my head, reliving every moment of a steamy encounter from weeks ago. We were both so lost in the moment, our hands exploring each other with such desperation. She was moaning softly as I pressed her against the wall, and when we finally fell onto the bed, it felt like time stopped for just us two. It's hard to let go of that feeling though. I try to move on, but every night my mind replays those moments again and again until I'm lost in them completely. It feels wrong somehow, being so obsessed with something that happened weeks ago. I know we both said it was just a one-off thing, nothing serious or planned. But part of me wants more, craves the touch and heat from her like an addiction. I guess what I'm trying to say is...I need help figuring out how to stop living in the past. How do you move on when your mind won't let go? It's driving me crazy with wanting more and knowing it'll never happen again.