Walked in on my bf masterbating.

I love my bf and we have been very serious. Our sex life has been great so that wjy I don't understand he would be masterbaying with me at the house with him. He wasn't watching porn or anything... I'll tell you what happened..

We were getting ready to go eat with my family... yes we were in a rush it was just the weirdest time to do that... I was putting makeup up on in the bathroom and he was just laying on the bed waiting for me. I went out for a second and he said he had to poop and went in there. I noticed it was taking an extremely long time so I went and knocked he didn't say anything. The door was ublocked so I opened the door ( and yes we both have walked in on each other pooping and it's never bothered either one of us) but this time he messing with him self, like full blown jacking his stuff and stopped and got scared quickly when he saw me. It was a huge turn off for me. 1 he could have asked me to do something with him, 2 we were in a rush to go out and 3 he was on the toilet... I was kind of hard on him and we've ki d of moved passed it but I don't know I just need to here others opinions.