How do you know if he's "The One,"?

Replace the word “know” with “feel” and you are already a fair amount closer to the answer.
One feels that the other is the one.

One probably never knows; one just takes an educated guess.

Do you want your boyfriend’s happiness even at the expense of your own?

Can you imagine living life without him in it?

Those are the kinds of questions that you need to ask yourself.

~ If he is the one then you should have no trouble asking him instead of us…
~ maybe Fluther is the one… since you asked us first.

When the person you love shows that they love you by treating you with respect and admiration, without attempts to control or manipulate and without any neediness, then there is no question that their love is true. If that same person’s lifestyle and temperament are compatible with yours, then they are likely to be a great choice for a life partner.

If there is drama and you feel angered by things that person does or says, than it is possible that one or both of you are not ready for a mature romantic relationship, and that there may be underlying issues with insecurities and fears that should be addressed by the individuals before getting involved with someone else.

In my personal history I had relationships – including my marriage – where the love was strong, but neither of us was capable of giving or receiving unconditional love. This resulted in many fights and great makeup sex, but not in a successful relationship. I’ve spent a good deal of time working on myself, healing the wounds from my past, and changing how I feel about myself and life. In my current relationship, there was never any question. Even when we hung out as friends, I knew that he would be a great partner for me; once we started dating, it was as solid as if we’ve been together for decades. Right from the beginning, people assumed that we were long married.

Yes, what tallj said: Fluther is definitely the one. Stick around for our collective wisdom. We won’t steer you wrong. Promise.

The smell, you can tell by the smell. If you are utterly intoxicated by the way he smells, he might be The One.

That’s the chance you take in life…..nothing is guaranteed….go with the flow and enjoy each other’s time together whether it lasts 10 months, 10 years, or forever :)

I thought I was with “the one” and 4 years later, I find out he isn’t “the one”, but the time we shared together I will always cherish…..

A lot of the time, you just feel it. You just know.

Thank you for your answers, both deep and not so… I guess the conclusion here is that there is no real foolproof way to tell… Damn. I guess Fluther shall be the collective ‘one’ for me until I figure everything out. :b