What should I’ve done / do

I don’t even know where to begin so I’m sleeping right and I’m not very heavy sleeper and my boyfriend not in bed and I hear the tv going and I wake up to see if he is sleeping because he’ll sometimes wake up watch tv go to back to sleep this time it was different I woke up and I saw him masterbating on the couch and I’m not saying what he did was wrong or I’m ashamed it’s normal everyone does it’s and I know we’re gonna have to talk about what happened but I don’t know I feel like I should have done something like asked if he wanted help or done something but I was just shocked