Je déteste le français. To say "I hate French" (as in the French language) in French, you would say, "Je déteste le français." If you want to say "I hate the French" (as in the French people), you would say instead, "Je déteste les français."
Invite him for a cinema some of these days, and kiss him tenderly. He will never forget. Do this good action. Then keep on talking and say that you love him too, when both you arrived at "his" home. Kiss him again and say : good night, sweetheart.