what do you think the reason?

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our friend, she having problem with his boyfriend, this guy is from u.s.she is a little naive and she connot speak english much. they start thier relationship,3 months ago seems ok,and they always call eachother well that what she told us. last week she is happy that finaly her foriegn boyfriend coming back becouse his work send them here.before he came he called her, then they met eachother and she stay to the hotel.after that she go home and though that she will come back to stay with him. but she was schock that he dont reply her call.and txt message. she starting to worried.but the phone keep rinnging and she dont hear anything from him for 2 days.then the other day when she was in the mall thier was crossed and his boyfriend with another male friend passes her and never look at her as if he dont know her.what a shock to her, he see her but its seems nothing. then now she dont know what happened this guy promis her everything but its like a big joke and she left hungging some question why suddenly seems he dont remember her.the night that she was with him was ok she said, he even promis her to come with her to meet her parents.then the following day.he seem he dont know her. what do you think about this.isnt it strange?