He doesn’t hate you but i bet he’s really confused. Sex complicate some things and Aquarius are probably the worst of the air signs to show their feelings, so it’s just confusing for him (check out my post about air signs, clicking on the tag). He probably doesn’t know how to act now. Aquarius boys and girls tend to confuse friendship with love because friendship is very important to them, so he probably never found out how he feels about you and now he’s stuck in this kind of limbo.
Also, Aquarius can be very dogmatic, specially as they grow up. They think they’re right about every subject: guys, girls, politics, religion, the weather. They are really smart and visionary, so they’re usually right, but they can be really stubborn too (they’re a fixed sign). If he thinks that’s the way your relationship should work, it will be hard to convince him otherwise.
But you can try! Organize some activities that remind him of your old friendship, and how special it was. If it doesnt work, you can always talk to him. Tell him that you feel he’s changed (don’t embarass him about the sex thing, even aquarius boys have pride), an that he should be more mature about some stuff. He will apreciate your honesty.
I recomend you to ask bearingwater or houseofaquarius too, just in case they understand aquarius boys better than us :P