What does "Tu amor" mean?
It means 'your love.' If tu is a typo and was supposed to be tú and there was also supposed to be a comma after it (tú, amor) it would mean 'you, love.' That does sound a bit odd just like that when translated, but I guess that would make sense if someone said "Who?" and another person said, "You, love." Amor is used much more commonly in Spanish than 'love' is in English, sort of like 'dear.'