There are two primary Greek words for love (phileo and agape).

Phileo means tender affection...cherishing the object above all else...manifesting an affection characterized by constancy, from the motive of the highest admiration.

Agape means: self-sacrificing...unselfish love, ready to serve.

Titus 2:4 is the only place in Scripture where women are encouraged or commanded to love (phileo) their husbands. The Greek word  for love in this text is quite significant. God tells women to love (phileo) their husbands because He made men with the kind of needs phileo could meet and He commanded men to  agape their wives because He knew that was what women needed.

Phileo love offers respect and "the highest admiration" to meet a man's need for significance. His need to be trusted and depended on is met by his mates submission. A woman's need for security is met by unconditional agape love, which provides her with a trustworthy assurance that she will be cared for even at the sacrifice of the one who loves her. To the weaker sex, agape offers strength.