Hindi cinema loves love-triangle. Love is complex. It becomes more so, if it is in a triangle. By triangular love story, I mean, one person is being seduce by two lovers at a time. Common sense says that way he /she/object will get two times love/gifts/ or benefits. But effect is opposite. He/she becomes biggest loser in end. Let's take some example.
Common family situation is when a husband gets in between mother and wife. Both loves him. As soon as he comes closer to one, another attracts him. In end, both mother and wife make him football.