You say that you're still on Tinder as well. Do YOU really like HIM if you're still looking at other options? What if YOU find someone better? What would YOUR reaction be if he told you that he was feeling threatened and insecure because you're still on Tinder? Would it be "well whatever I'll find someone better", or "okay, let's talk about being exclusive then"?

If you're at a point where you're willing to become exclusive, maybe it's time to talk about that. If you're not, then you need to accept that it's okay for him not to want exclusivity as well. Dating shouldn't be a competition - it's not about ranking people as better or worse than each other. It's about connecting with people, and figuring out what that connection means. Right now you're both still acting as though you're happy with multiple romantic connections in your life, but if you're not, Talk About It!