Why is my roommate behaving so distant?

Hello! For my last year in university I moved into a student‘s dorm. I moved in here in September after I ended a long and really toxic relationship. I met my roommate, who also happens to be in his last year but who’s also an exchange student.
I immediately felt attracted to him and involuntarily started flirting on every occasion. I didn’t even realise I was flirting. So 2 months later we had a few drinks and ended up sleeping together. I was stupid enough to tell him that I just got out of a relationship, but I was drunk.
We hooked up some more and then he went to his country over the holidays. We hooked up again when he returned last week. We‘ve never talked about what’s going on between us although it’s been 2 months of sleeping together.
But what irritates me the most is when we were intimate we talked for hours and hours but when we meet in the public kitchen we only share a “hi“ and “bye“. Now after the last time we slept together I feel like he’s become completely distant and it really hurts me. I wonder what I’ve done wrong. I also realised that I’ve started to develop feelings for him and perhaps it’s better to call it quits but on the other hand I’d really like to ask him what his problem is. Perhaps he noticed me falling in love with him. I don’t exactly have high hopes with him - I know that if he‘d wanted me, he’d act on it (although I wish he’d wanted me). I just can’t handle the current situation, it bothers me a lot. He also has his final exams in 2 weeks so perhaps he’s thinking about different stuff than hooking up with his heartbroken roommate.

so what should I think about his behaviour? Should I ask him why he’s so distant or should I maybe just accept that it’s probably over and get over it?
Why is my roommate behaving so distant?
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