What was the common thread from when you met the person? How did you hit it off with them?

So I've been married for 12 years, and we've been together since college, where we met. And my wife's basically the only person I interact with socially. And I think I'm straining my marriage by using her as my crutch. I've kind of relied on her for literally all of my socializing, like tagging along with her and her friends. But I've recently realized that that's not healthy and I need someone to talk and interact with independent of her. But it's really hard.