How do you not feel insecure when you're not exclusive with them yet?

I've been seeing this guy for a month and really like him. The problem is, we haven't had the exclusivity talk yet so I'm 99% sure he's talking to other women. I've swiped for guy friends before so I know what the "market" looks like and it makes me feel sick. I know I'm at least somewhat attractive, but by conventional standards, there are so many women out there who are prettier and cooler than me. I keep thinking about him shooting his shot with these women, going on dates with them etc. I also can't help but wonder if he's settling a bit with me, if I'm the safe/back-up option.

How do y'all not go insane? And don't tell me to just continue seeing others. I've been doing that but I like this guy best.