Romantic love is surely the most complex of human emotions, mediated by all of our senses. On the other hand, we cannot choose to love someone.
Neither are we loved by choice; rather, love is serendipitous. Nevertheless, as many humans know, love is not always returned and, even when love is mutual, there is no guarantee of compatibility or ongoing happiness. True love endures but relationships often fail.
Finally, we may (and often do) love more than one person in our life. This is complicated by the fact that we cannot choose to unlove anyone.