To put it in terms that might be more familiar around here, obsessing over finding the right partner is like believing that a successful startup is mostly about finding the right idea. (And from there, it will just work out on its own...) Sure, some ideas are more likely to work out a priori, but your success is going to be dramatically influenced by the amount of work you're willing to put into it, your willingness to learn, change, and grow along the way. I'm inclined to believe that there are tons of people with whom most of us could be compatible, and each would open onto a different future and a different version of you. If you want a long-term partner, choose someone who feels promising, bring all you've got--intellect, emotions, empathy, humility--to the relationship, and stick with it.