Can U please tell me whether "her saying bai " really means something negative ?

I would really appreciate you answering my question.There is girl who knows that I am interested in her.But she already has a boyfriend.last night we were speaking on the phone for 5 hours 12 am to 5 am This evening I phoned her and she said that she didnt sleep the whole day too.So I said why didnt u sleep. she said "Neend nahi aaee bai". So does bai mean brother here . Is she trying to put me down . Last night I acknowledged that I have feelings for her . We have been talking for 6 months and she was also emotional last night She also asked me how would I feel like going on a trek with her

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