I tend to have my phone with me all the time and I do take it into the bathroom with me when I have a shower/bath. And I always have it on silent, too. I'm definitely not having any kind of affair!
I know some people find that weird/unhealthy/whatever but it's really just down to personal preference. My phone is my clock and alarm (I don't wear a watch), a source of news (BBC, newspaper subscription), a diary (calendar app), a library (my Kindle and phone are synced), music player (not just for music but for audiobooks and podcasts), radio, TV, camera, debit card, travel pass, entertainment (puzzles and games), notebook, shopping mall, and a means of chatting to friends and family (text and social media). I can also control my central heating from it and use to remotely record stuff from my Sky box, and there are a million other things I use it for as well. So, it just kind of comes everywhere with me.
In the shower, I'm mostly using it to keep an eye on the time, or I put Radio 4 on to listen to while I'm getting ready. I don't think anyone would bat an eyelid if someone said they listen to a radio while they shower, would they?