In Italian, there are two phrases you say to the people for which you feel something: ti voglio bene and ti amo. The first is less strong, and it is not something that you would say to your lover; you could say it to a friend, your parents, your sons, or a sibling, but saying ti voglio bene to a lover would not be something well seen. (That would mean getting an answer like "You don't love me anymore?")
When translating those sentences with Google Translate, I get "I love you" in both the cases. So, what does "I love you" mean?