Trying to trust him

My husband likes this artist that's going to be performing in our state. He wanted to go with his friends but he also didn't because he knows he's broken my trust in the past by talking to his ex, going behind my back with a few things and etc. Well the concert is 18+ and his friends have all these stories about women taking their tops off and stuff so I'm scared but I'm buying him a ticket because I know if he doesn't go he's going to regret it for a long time because he only listens to this one artist and I don't want to hold him back from experiencing things. Am I doing the right thing? I'm really nervous about it