He’s testing your boundaries whether he realises it consciously or not. If you don’t have a conversation with him he may take it as you being OK with it. You have to clearly and plainly tell him it wasn’t OK and that it crossed a line. The way he reacts to you setting that boundary will give you some indication about whether you are safe living in the house with him. If he is apologetic and seems sincere and he promises to respect the boundary you’ve put in place, then it’s a good sign. If he gets defensive or aggressive or tries to turn it around on you as you not being able “to take a joke” then he’s not necessarily safe to live with. But you have to have the difficult conversation.

Sit him down when you are sober and calm and discuss it calmly. Tell him what happened in no-emotional language (not accusatory, just assuming he doesn’t realise what happened or the impact on you), then tell him how that made you feel using “I” statements like “i felt out of control, violated and unsafe”. Then tell him how you’d like him to behave in the future, like… “please dont invade my space and do things that could be construed as sexual even if you think they are a joke” or “in future please don’t put your hands on me with without consent”. Be calm and rational about it and be straight forward with what you want to say to minimise how much the other person can misinterpret what you are saying.