Never thought of it that way. To not have any love interests in any story which spans several years would make the characters unbelievable and wooden.
People fall in love all the time and quite often find themselves in love triangles.
I don't know about you, but I think anyone who has no love interest in five years of adult life has a problem. The objections did not come from her family but from her society. The issues were primarily of power and interpretation of ancient text which is quite different from saying her family objected. Straczynski often chose to push the supposedly absolute boundary of death. Yes there are common elements between B5 and a soap opera, but it is a question of focus.