Man using french fries as vampire teeth\\"Five Traits a Guy Should Have Before You Get Serious"\\© Tamara Schlesinger, courtesy of Cosmopolitan

You get butterflies when you see him, your heart pounds if he calls, and kissing him literally causes goose bumps. With chemistry this amazing, you'd figure you're destined to be together.

As it turns out, not necessarily. "We often mistake a strong physical connection as a sign that two people are meant for each other," says Paul Dobransky, MD, founder of womenshappiness.com. Yes, chemistry is key to a lasting bond, but it isn't the final word. Other factors should be considered too, and they take some sussing out. New findings describe the characteristics in a guy that actually predict relationship success, some of which you may be overlooking.

1. He Knows What He Wants
Any guy you're serious about should be able to articulate his long-term goals and passions (sorry, fantasy football and Xbox don't count). He can't ally himself with you until he has a sense of how he envisions his life in the future ... and how you fit in. "If a man has no idea what he wants to be when he 'grows up,' then it will be impossible for him to commit to you," says Dobransky.

Don't assume he'll work things out, because when he does, you may realize his ambitions don't mesh with yours. "This mistake has contributed to the starter-marriage phenomenon, in which couples in their 20s and 30s suddenly realize they're going in different directions and divorce at an early age," says Dobransky. "It's preventable as long as you're both clear about your plans."

2. He Has a Sunny Outlook
A recent study led by the University of Oregon found that women who had upbeat partners felt more satisfied in their relationships and — this is huge — that the man's level of optimism determined the relationship's staying power. Not only is it nice to have someone help you see the silver lining of a situation that totally sucks, but cheerful guys are good at keeping things in perspective, so they don't let little conflicts get to them and can go with the flow.

Along with having an optimistic POV, it's also crucial that the guy you're seeing can make you laugh. "It's an important stress valve for any couple," says Les Parrott, PhD, coauthor of Trading Places.

"Having a sense of humor helps you weather the rough patches that you'll inevitably encounter together." It shows that he is able to let loose and doesn't take things too seriously. Plus, you'll have a better time together if you can see the funny side of things.