Taylor Lautner cautious about relationships

London: Actor Taylor Lautner says he has to be careful when he meets new female friends. ``I do have to be more careful. I would be lying if I said that I don`t guard myself more than I used to, but I don`t want to be too guarded," Lautner told a magazine, reports a website. ``If you have so many walls up that you can`t even make new friends or find new relationships, that would be a bummer,`` he added. IANS