my boyfriend went to a strip club

My boyfriend went to a strip club without telling me. We took a few days off for Memorial Day weekend. On Tuesday which was the last day of our vacation, we spent it together cleaning his room. I went home around 9pm. Apparently he went to the strip club after and spent $110. I found this out because I looked up his account history and I saw a phone number, which I later than googled to only find a strip club right by his house. 
I hate that I looked it up. Im not like that at all, but I'm so heart broken because he should've just told me. 
I want to bring it up to him but I know he's going to get mad I looked up his account. 
How can I bring this up?