How to break a habitual masterbator?

Lorerta
Please halp!! Hahaha
Long story short, I'd like to enter my shared room with out seeing my boyfriend masterbating every time. 
I've explained that it's an private thing to him yet still, every time he thinks I will be away for more than 5 minuets he's jerking his chicken. 
What bugs me the most is that he will lie next to me while I'm asleep and be watching porn. Every time I wake up to that it ruins my whole day. 
I've just run out of ideas to stop the madness. Offering sex isn't an alternative bc he says it's not a sexual thing. He just does it out of ritual at least twice a day. 
Which again, I don't care that he does, I would just like to be able to go grab a drink and not come back to him watching porn and masterbating.