When did you know he or she was THE ONE?

We worked for the same company, different branches. My manager was his friend. Apparently we would have the same goofy reactions to things and made the same comments about things to him. We met at a company meeting and we all went out afterwards. We clicked and I mentioned we should hang out. He then started to tell me all the things he had going on, trips out of state to his parents, a reunion, etc. I told the boss/friend how he blew me off about getting together. On our first date he swore he was legitimately busy and had every intention of calling. Then he said 50 years from now are we still going to be arguing about this? I could see ourselves 50 years from then and right then I knew we’d get married. I went home and told my mom I just went out with my future husband. We got engaged a year later and married a year after that and next month is our 23rd anniversary.