Confused.....

I have met a guy online and we met up within the week. Had sex the first meeting. We still talk by texting back and forth and he has said on numerous occasions that he wanted to continue seeing me when I go back to school (I’m a senior in college). He has stated that he is just looking for someone to have conversation and spend time with while I ultimately would like a relationship. We are just three weeks in. I feel like I should know whether or not he is seeing other people especially if we will continue to have sex but I don’t know how to come out and say that. So in others perspective are we just fwb and how do I bring up that topic ( I feel like I should just say it)