This is a profound psychological and astrological warning about the company you keep and the people you fall in love with.
Dr. Sharma explains that love ("preet") is an energy transfer. If you fall in love with someone who has high morals, high ambitions, and a pure character ("oonch"), their positive energy will pull you up, and you will rise in life.
But if you fall in love with someone who has low morals, toxic habits, or a degraded character ("neech"), their heavy, negative Karma will drag you down. You will eventually fall into a dark well of despair ("kuen mein gir jaye"). Choose your partners wisely.