Looked at his phone

Okay I KNOW this was so wrong and I definitely should NOT have done it but I was just so snoopy and ugh. We've been together a year and a half and he's always complaining about me on my phone so I took his phone like as a joke and went in the bathroom with it and I just went through it I guess. Like I didn't expect to find anything I was just curious I didn't mean to do it!! I found messages from him and other girls that seem really suspicious an I don't know what to do.. I want to ask but I know what I did was beyond wrong and I don't want the embarrassment of saying I snooped.. But the messages from him and the girls definitely were not appropriate.. Help! :(