Romantic love and Buddhism
Buddhism has two levels of teaching: 

(i) worldly/moral; and 

(ii) non-worldly. 

Non-worldly love is universal love of metta (refer to Sn 1.8); which does not include sexuality. 

Worldly moral love is fidelity or loyalty to one person (refer to AN 4.55). Romantic love can exist within moral love however it is the non-romantic mutual life goals &amp; qualities that are the most important criteria in Buddhism for a lasting relationship (refer to AN 4.55). If people engage in sexual relationship, in Buddhism, this is done without sharing your partner with others.