[K. in Cleveland]

Well, as far as him not wanting to talk about it, there are a number of possible reasons. He could have a relationship with someone else and be sorry he cheated... you say he is a front desk guy, I assume this is a paid or internship position, perhaps he is prohibited from the school to have relationships with the residents.. or he could be a guy who just likes to wham bam thank-you ma'am... or anything between or any combination. It's going to be a fact of life that you will see him, you will run into him, but that does not mean you have to like him. My best advice would be to be cordial and polite with him, but not really try to gain a friendship.
As far as feeling a bond between you and your sexual partners.. well.. I think that is a protective mechanism some women develop in order to "claim" their guy. There is really no reason you have to have a bond with anyone you've had sex with. Sex and feelings do not have to go hand in hand. They can, and most certainly do for many people... but they are not exclusively together.
I think you have experienced a one nighter, and are none the worse for wear because of it. Enjoy what you experienced, and move to what you want. If you want a relationship, look elsewhere as this does not sound like what he wants.