While chocolates and roses might bring a smile to your partner's face on Valentine's Day, they'll do little for the health of your relationship over the long term. As I explain in my book, 13 Things Mentally Strong Couples Don't Do, knowing your partner's love language and going on weekly date nights aren't enough to maintain your bond—if you aren't working on strengthening your relationship in deeper ways.

If you're in a committed relationship that you want to stand the test of time, use Valentine's Day as an opportunity to strengthen your relationship. The best way to do that is by focusing on becoming a better partner and by developing habits that will cultivate long-lasting love.

Whether you keep a fun picture of your partner on your desk or turn a recent vacation snapshot into the wallpaper on your phone, studies show that just looking at your partner's photo throughout the day improves your relationship's commitment and quality.

Partners who regularly looked at a picture of their partner reported increased healthy attachment and higher degrees of marital satisfaction. So, use Valentine's Day to take a great picture of your partner, and then keep it somewhere easily accessible so you can look at it throughout your day.

If you've been together a while, your lives likely look quite different compared to when you first got together. The demands of careers, kids, extended family, and........

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