When can you ask?

I’ve been “talking” to this guy for about two months but we actually hung out for the first time about a month ago. I’ve seen him 8 times (I’ve kept count lmaooo)

We get along well and I’m so comfortable with him! We’ve done everything but fuck at this point, but I am planning on fucking him soon. My question is, when is it ok to ask what we are? We’re a “thing” right now but I don’t want him to see other people while he’s talking to me which I’ve made clear and he’s ok with it. I just have trust issues and think he’s talking to other girls and that really bothers me! What should I do?