Most Helpful Guy
Of course it can, yes. Sense memory. Our senses can invoke memories, it is often used as a technique by actors and actresses to bring on emotions when needed. It might be a sight, a sound, a smell. All of our sense can automatically trigger associated memories.
It's important to remember, however, that it isn't four years ago and that makes a big difference. You are not the same person, he is not the same person and it's a completely different time. Time doesn't stand still and neither do we. There is nothing to say that anything would be remotely the same between you two now.
Most Helpful Girl
Of course it can. You almost vowed to spend the rest of your life with that person. You will have feelings probably even twenty years from now. Don't get me wrong, you will find the true person you were meant to be with, but especially if "that guy" was a first in many ways, you will ALWAYS remember him, and have feelings for him. Trust me!!!