How do you know when you've found "the one?" Well, you'll just know. I could end the article right there, but it might be too brief, so allow me to elaborate. People will go their entire lives trying to find "the one," and there are those who couldn't care less. Meanwhile, there are also others who want to find that special someone, yet that isn't their primary focus at the moment. That's the category I fell into for a long time. And notice how I used the past tense. I'll describe in more detail momentarily.
To me, there is a distinct difference between finding "the one" and simply finding a relationship to be in. Being with "the one" is your idea of being someone that you want to spend the rest of your life with. Someone you would want to be in a long-term relationship with and isn't the flavor of the month. Someone that you think completes you, or at least accepts you complete. Again, I'll get into how you know deep down whether or not that person is the one for you (and the criteria is different for everyone), but there are people who are content being with someone they find attractive and/or are interested in and nothing more, and that's totally fine.