"Many people believe that romantic love is the same as passionate love, It isn't. Romantic love has the intensity, engagement and sexual chemistry that passionate love has, minus the obsessive component. Passionate or obsessive love includes feelings of uncertainty and anxiety. This kind of love helps drive the shorter relationships but not the longer ones."

Yes, love can last in long term relationships and marriage, provided follow these 4 rules for a successful relationship;

Be "There" for Your Partner

This research shows that husbands and wives who feel supported in their marriages are happier. On the other hand, "feelings of insecurity are generally associated with lower satisfaction, and in some cases may spark conflict in the relationship. This can manifest into obsessive love." To build a successful marriage, both spouses need to be there for each other.

Remember the Stages of Love

Long-term romantic relationships go through distinct stages of love – and the passionate love at the beginning can’t be sustained throughout the whole marriage!
If partners are aware of the “highs and lows” in love, the happier they’ll be for the long-term (because they won’t have unrealistic expectations for romance or passion).

Let Go of the Little Things in a Relationship

The trivialities of daily life can undermine a loving relationship. Instead of getting caught up in details that are likely petty and unimportant, focus on the big picture.
For instance, be grateful that the bathroom is being cleaned (instead of fretting that it wasn’t cleaned with a particular cleanser).

Maintain a Strong Friendship in Marriage

To build romantic love, take time and energy to be friends with your husband or wife. Learn new things together, such as how to bake a cake or cook some yummy dish. Take an adventure vacation together. Read books together, about companion love and building a happy marriage. Make it a habit to please and give your partner what he or she needs as much as possible.

"Couples should strive for love with all the trimmings and couples who've been together a long time and wish to get back their romantic edge should know it is an attainable goal that, like most good things in life, requires energy and devotion."