How can I trust my boyfriend?

My boyfriend is a professional cricketer and he's gone to Australia for six months. I'm just really worried that he's going to cheat on me, I mean, Australia has all those hot girls wandering round in bikinis. I said this to him and he said he's not going to, but he's gone out there with two single guys who love to go to clubs everynight nd pull as many girls as possible, not to mention their regular trips to the strip club. I know my boyfriend said he wouldn't cheat but he's a real people pleaser and will do whatever people ask him to do to make them like him, and these two will bully him until he gives in to what they want him to do. I just really don't know what to do, please can someone help?