If you are alone and miserable, then you are still looking for love, even if its only internally.
If you aren't looking for love, then that means you aren't looking for it on both the outside and inside (and thus wouldn't be alone and miserable, assuming you literally were not 100% alone from family, friends, and co-workers).
I'm not saying being proactive doesn't work - but there's a very very fine line between being confident and proactive about your relationships with others (while still maintaining that self-worth), and being constantly on the lookout simply because you feel like you need to find "that perfect person" in order to make yourself feel full of worth... which is a lie. A lot of people who are desperate for a partner I feel jump onto dating websites and such blindingly because of them feeling like they need to be in a relationship, instead of looking into themselves first.
It's simply a fact that people who aren't comfortable or confident in their own skin (on average) don't make very good partners. The line "when you don't look for love, love will find you" is directly applicable to this scenario that many people go through because it implies that the person stops relying on others for self-fulfillment. In turn this ironically causes other people to be more attracted to your positive energy, and the time spent being "alone" doesn't feel lonely at all. I don't feel like the phrase applies in your case, as it sounds like you have a pretty sound idea of yourself and what you personally want out of your life.