Should my boyfriend be allowed to look through my phone?(Free AppLock about Privacy)

I've always had a very simple policy when it comes to people (mainly my parents, boyfriend) looking through my phone or computer :(
You can if you want, but when you find stuff you didn't want to find that's on you, I ain't losing sleep but you probably will.
I keep plenty of shocking things on my devices, some of it for no reason, some of it for very particular reasons. If someone went through my phone they would cause themselves more problems than they caused me. So far no one has tried it.

So I used Applock from Domobile. I am using it from couple of month on my Xperia Z phone.. Battery consumption is quite ok not so heavy. Other features are good like locking files, videos, photos, or harassment intercept etc. No one can view my phone. Smart
It's download link: https://play.google.com/store/apps/details?id=com.domobile.applock