Ok, easy one to answer, OP. How old are you, how long have you been together?
I started seeing DH when I was 23, he was a year older. At that age, it was full on butterflies when I was catching the bus to meet up for a date, goosebumps when he touched me on the leg, hours and hours passed so quickly when we were on our first few dates, similar stories about backgrounds and life's dreams, even down to bucket list holiday destinations etc etc. I knew he was "the one" within a few weeks. I think he did too - it was full on puppy dog eyes and I'm nowt special to look at really!
The point is, we just went together perfectly.
We have now been together over 20 years, 2 kids together. It is DIFFERENT now. There is a deeper comfortable love, and no longer a frisson of shivery "oooh" if he accidentally brushes my leg. This is understandable, we have been through life events together, like labour, bereavement etc.
If god forbid I was suddenly single at this age (mid 40s) then my view of what would constitute "the one" would be vastly different to what it was in my 20s. I would be looking for attraction, yes, but also compatibility, companionship, and stability. And looking to see how he treated ex-wives, children etc.
So, a lot depends on where you are in life.....