i really dont know what to do

so my wife and i have been married for like 3 years now. its good but there is this thing that has been happening lately that makes me feel so weird. last week we went on a trip and it was just the two of us, no kids or anyone else around. one night we were drinking and talking about old friends from college. i told her about my best friend who always had these wild stories and how he used to hook up with random people online. she seemed kinda interested but also bored at first. then for some reason, as the night went on, i started getting this urge to try it myself. not really that into it before but something was just gnawing at me. so when we got back home and everyone was asleep, i checked my phone and found a hookup app i had deleted years ago. just looked through profiles for a bit. then one guy pm'd me saying he wanted someone to play housewife roleplay with him - pretend like im his wife or girlfriend and send naughty text messages. i didnt respond but it got me thinking... the next day we both went to work and at some point my phone buzzed again, more messages from that guy about this stuff. i deleted them all right away but when i was alone later, id check the app and browse some more. i know im being totally ridiculous - there is no way shes gonna be okay with anything like this. i mean we do have good sex but its just nothing crazy or adventurous compared to these things. i dont even wanna talk about it to her because she will freak out and think i want a divorce or something. i feel so trapped, not knowing how to stop thinking about it or telling her. what should i do? is this normal for someone in my position?