Newlywed says all the travelling makes monogamy difficult. Scarlett Johansson believes it’s almost impossible to hold down a relationship in Hollywood. The 23-year-old actress – who married Ryan Reynolds, 32, last month – says travelling so much for the job makes it difficult to stay faithful. “Relationships aren’t easy,” she says. “I believe in monogamy, but it’s hard when you travel and actors travel a lot.” “It is an effort, but I don’t want to be in a relationship that isn’t worth making that effort for.” Scarlett has just finished filming He’s Just Not That Into You with Jennifer Aniston.