This seems to me to be more what you need than an apology (which I am not opposed to you asking for). But in your shoes, I would say "I am having trouble feeling safe in here and this is why . . . . . "). Talk about what makes you feel safe and unsafe first because I think that's where you will find a deeper conversation about what's important to you.

Personally apologies have never held a lot of weight for me. I don't mind them and they do tend to provide some kind of closure to some upsetting event. But the thing for me is being understood about the past and helping the other person understand what I need in the future. I don't usually get that from the apology per se but from the discussion surrounding that.