<human>: Me: 25/f  Him: 24/m (about to be 25)

So, I made a post about.. two months ago about some guy who never really followed through. I got tired of it, and put myself on OkCupid. That was an interesting experience, given that I developed a stalker (BOOOOOOOO) and did meet some awesome people from the site. Obviously, one of them stood out.

He and I have been seeing each other for once a week pretty much every week, for two months. We sometimes saw each other more, but he's a busy guy with grad school. We have also become physically intimate, and we both agree that it's good stuff (hooray orgasms!) + we have chemistry. Also, he's sweet and relatively sane.

My issue is this: How should I go about asking about intentions regarding dating and where we stand with one another? I know I could just blurt it out, but we talk to each other on facebook a lot more. I don't know if this would be a better thing saved for face-to-face on one of our date days, or if it could be broached over facebook. 

He's admitted to liking me, likes having me sleep over and even just be around when he's busy studying, and thinks I'm the bee's knees. I'm surprised with how much I like him, since I did kind of recently get out of a relationship, and it's not like I was rushing to find something new to replace some void. 

Also, if this would be better placed in r/relationships, please tell me!

Can you summarize the given text in a few sentences?
<bot>: guy and girl meet on okc, hit it off, have lots of fun, girl wonders how to best broach exclusivity conversation without seeming crazy or clingy, even though it seems like he might be amenable to that conversation