Masterbation

I confess my boyfriend isn't as sneaky with masterbating as he thinks he is. 
I used to believe he never masterbated just because of how he talked as if he was disgusted by it. 
Now I've been catching him all the time! It might be because I'm pregnant and we dont have much sex anymore but I've been giving blowjobs like crazy! And when I'm able to have sex I'll offer but he doesn't want to now that I'm so far along.