Girls, Why won't she tell me about him?

There's this girl I met at uni who just moved to my country. We have classes together, but we rarely talk there cause I always sit with my friends. We live pretty close to each other so we go home together on the same bus. I'm supposed to hop off 1 stop before she does, but since we're chatting I usually forget so I go with her. Based on an Instagram story, i'm 95% sure she has a boyfriend from her home country whom she met last weekend. But when I asked her about her weekend she said she just had been studying, and didn't mention any guy. Could there be any particular reason for her not to tell me about him?

Girls, Why won't she tell me about him?
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