Don't ever regret a relationship that has ended but at one point made you smile. Whether it's your boyfriend of three years with whom you didn't see a future or an old friend who stopped putting effort into seeing you, they made you feel happy along the way, so you shouldn't lament having them in your life. What's more, you likely learned a thing or two from that individual. Maybe it was how to swim, how to cook, or the best way to approach your boss about asking for a raise. Relationships sometimes end miserably, and there's nothing wrong with not wanting to see or hear from the person again. Still, you shouldn't regret the existence of that relationship, for it helped mold you into who you are today. Perhaps it made you realize the kinds of friends or partner you really yearn for in your life. Sometimes we go through a bad experience with one person, learn from our mistakes, and have a much better experience the next time around. That's pre...