How was the beginning of your relationship with your current long term partner? Did you click right away or not? If not how did you start liking each other?
I have been in three longer term relationships in my life and a few short ones.
All of the long term relationships have had an instant spark. Almost an intitative connection that I would say was love at first sight. That said, I don't know if that is real. I suspect that it is a subconscious process of evaluating that occurs more quickly than we realize.
The first was a college romance and lasted about 2 years.
The second resulted in a 30 year marriage that ended in divorce.
The third is 5 years in and going great.
The short ones all had passionate sex but the connection was never as strong.