Work life balance ????

So I have been kind of involved with a coworker of mine for about 8 weeks now... and by kind of involved I mean sleeping together and hanging out on several occasions. We both plan to leave the workplace within the next couple of months and we’re both going our separate ways for grad school, which I knew going into it. No expectations of anything serious or truly romantic. However, I did really enjoy being friends with him at the beginning, since we would hang out for movies & went to grab food a couple times, and we’d text and joke around all day every day. But now, it’s clear that it’s just sex for him, as he literally doesn’t text me unless it’s strictly related to that, and has rejected my invitations to do just friend things (hiking, movie night, etc). But he’s still very (superficially) friendly with me when we’re at work, and has also been making moves on me there in my office (which is very hot, not gonna lie). I’m torn because I don’t want to be used, which I feel like I am, but I also don’t want to stop sleeping with him because let’s be real, amazing sex isn’t easy to come by. How do I navigate this?