Why are relationships on the decline? Because the advice being given is flawed. It emphasizes the cozy, warm, fuzzy emotion of love over the super-charged, deeply erotic, electrifying feeling of lust.
The term "love marriage" is absent in the West. In India and a few other countries in South Asia, it would denote one of the two possible ways leading to a union, the other being arranged marriage.
India's biggest female tennis star, Wimbledon contender Sania Mirza, is in love, and she's set to marry a Pakistani -- Shoaib Malik, a well-known member of Pakistan's national cricket team.