From dating to exclusive relationship
When you're at the store, you pick up his favorite candy/soda/lemonade just because.You don't even have to wonder about whether or not he'll be coming over sometime soon because you know he will. This is because making plans with him is incredibly easy.He doesn't possess the gene that makes some men incapable of choosing a day, time, and location to get together with you. It's amazing and you don't need their opinion on it.(Why do so many men have an allergy to definitive meeting times and places??!! You love that only he and you can possibly understand how awesome your chemistry is.9. Partly because you have found someone who is so far removed from obnoxious, you don't know how you ever dated anyone that weird and bad before him.11. Even though you haven't known him that long, he's dropped hints about how impressive he's told his friends you are. To see how each other's days went or make plans for Friday night.14. You couldn't believe how easy it was to resolve the issue, having been with so many people before who didn't listen to you or try to see your side of the story.15. You're proud to be dating him and want your mom to know you're done with skinny-leg Jed or whoever.16.
Just even thinking about opening Tinder exhausts you way more than usual.
His feelings may change over time, but given other information you’ve included in your question, I see clues that would seem to indicate that it is not likely.
You mentioned that you have been sending e-mails to him, and sometimes he does not reply to them at all, and when he does there is a delay, and the content of his e-mails seems to be very impersonal, belying your interpretation of your face-to-face experiences with him.
For him the level of communication he’s providing you is acceptable, but to you it’s not enough.
Sarah, the right man for you will never have to be chased for attention, and he will reply to you in warm and personal ways.
Since he is aware of your desire to be exclusive and has expressed to you that he does not share the same interest, and has no problem continuing to see you, it is now up to you to decide whether that arrangement is something you would like to continue participating in.