To love: language comparisons

Most of us uses English as their universal language, so we are aware that "I love you" is something I can tell to a partner for life, but also to a family member, to a friend etc.

In some other language (EG: Spanish, Italian, Japanese), that's not common.

Do you know other language apart French and English in which this is the norm?

Do you know if there is a reasons behind it?