New Delhi, Jan 16 (ANI): Jennifer Lopez has confessed that she is unsure if marriage is on the cards with toyboy Casper Smart. After three failed marriages, the 44-year-old singer said she doesn't know she will ever tie the knot but insisted that she still believes in the institution of marriage. The Latin popstar said that she believes in marriage but it is difficult as she has had her challenges, but at the same time she believes in love and thinks that is the main thing.