I feel pretty silly writing this but I really need outside opinion on my situation. I've been with my boyfriend for about 6 months. We both go to the same uni but hes a year older. Our relationship started of as a drunk hook up that went on for just over a month, where we would get together whenever we were at the same party. During our hooking up, we would spend the mornings together cuddling and talking and I realised I actually liked him as a person and told him that I didn't want to continue things as they were as I started to like him. He told me he liked me back and we started dating (not official) for about 1 month where we would actually do things together outside the bedroom like go on dates and pretty much act like a couple. He also introduced me to his friends and he met mine. After that we made thing pretty much official even though neither of us saw or talked to other people during our 1 month of just dating anyway. Now I would say we have a pretty good relationship. We see each other pretty much everyday even though hes busy with uni work and a job, our sex life is also pretty amazing, we text everyday, rarely argue (when we do its very fair and he usually tries his best to calm me down and resolve the issue, hes never got aggressive with me) he buys me little thoughtful gifts from time to time and compliments me often.
Probably my biggest concern is that he pretty much takes his phone everywhere with him. He rarely leaves it and even takes it to the bathroom with him. I can sometimes hear him watching videos or opening snapchats when hes in the bathroom, however could it mean that he's also talking to other girls and doesn't want to leave his phone alone in case I see it? He usually spends a while in the bathroom with his phone and it concerns me. He is way more outgoing than I am and has more friends and I know he talks to a lot of people in general, but just the fact that he takes his phone to the bathroom with him pretty much everytime that bothers me. Otherwise he's not really that secretive with his phone (has a password on it but so do I and most people I know) and hes dosent mind scrolling through his phone while im next to him or reply to messages. I also seen him type in his password a few times so its not like hes making sure I dont know it. However I still can't help but wonder why he has to have the phone on him all the time. Its been like this from the start so its not like it just started happening but I am literally going crazy with suspicions. What do you think? Is there a way I can subtly ask without accusing him or sounding crazy?