Un hombre puede ser feliz con cualquier mujer, en tanto que él no la ame.

English Translation

A man can be happy with any woman, as long as he does not love her.

Isn’t this another redundant use of él? Who else could be the subject?

English Translation

A man can be happy with any woman, as long as he does not love her.

its jsut for emphasis, lots of things are redundant in all languages, putting someones name after saying ‘hi’ in english is usually redundant but people do it