Why is my roommate suddenly awkward around me?

after a night of drinking and honest talk with my roommate, she suddenly got awkward with me since then which was last week. we were talking about past relationships and she started to cry when she described hers. her ex cheater on her. i also told her I've never met a person who has never made me feel butterflies or even had a crush too. she's gone from happy and carefree to closed and stares at me a lot when she thinks i dont notice then looks away quickly when i catch her. she didn't seem too happy when i reinforced we are friends as well.
Why is my roommate suddenly awkward around me?
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