Do you ever wonder "what if"?

This isnt a problem im having, just something I do from time to time. So here is an example of what I mean. I will choose a path in life that im 100% happy with but there is always that little voice in the back of my head that wonders what life would be like if I chose the other.
Example: Im in a relationship that I could not be happier with, everything is perfect, even the fighting, he gives me everything in life I could want, takes care of me, is there for me in every way, we plan to get married one day, so on and so forth. Yet I will still wonder sometimes while being 100% happy with him/us, “is he really “the one”? or is “the one” someone from my far back childhood that I have lost contact with and 30 years from now we will run into each other and thats when our lives together are suppose to start.

I want to make it clear that im NOT second guessing my relationship, and im NOT going to do anything that would harm it. these thoughts have NO “feelings” to them they are simply thoughts

So do you have the same types of “What Ifs”? Ones that have no feelings to them that are simply “hmm I wonder” thoughts?

If so, what are they?