According to this article, Matteo Manassero has actually told the whole world that he doesn't have a girlfriend. He doesn't realize what he's just done to himself. Here's some advice he should take:
1. Don't date tennis players.
2. Don't date celebrities or the daughters of celebrities.
3. Don't buy presents for the girlfriend. Pick wildflowers for her or write a poem.
4. Don't get married until you're 30.