You aren't always joined at the hip.
Just because you don't constantly run in the same circles doesn't mean you aren't completely committed. Spending lots of time together is great, but so is doing your own thing from time to time. You understand that your partner sometimes goes out with his friends without you, and you do the same. And when you're apart, you don't spend all night texting and worrying about where he is and who he might have run into. "You're secure in your partner's love and desire for you, so you're not threatened by any other woman who may come along," says Greer.