After dating you exclusively, he now no longer wants to date only you. He wants to play the field and see who else is out there because there might be someone better, but he wants to continue to date you. This is a step backwards. If you’re interested in a long term relationship that is monogamous or marriage, this isn’t your guy. Move on! 😉
Not everyone is going to be a perfect match, and he’s given you the opportunity to know where you stand. That’s a gift. Use it. 🙂