No worry, no restrictions for its longevity. But if the love between two people is unidirectional, that is one-sided love. Then tensions arise in the life of a person whose love is unidirectional. The person does not want to lose his/her love. He/she want to get his/her love on any price. There can be several reasons for one-sided love. The first reason would be that your loved person does not see your love because of no interest in you. The second reason he/she might be in love with another person. This hurts deeply when you love a person, and he/she did not consider you attractive and also not shows love towards you.