Should i be concerned about obsessive girl and my boyfriend?

so, i was looking at my boyfriend's myspace, and on his friends list is a girl i went to school with a few years ago. she moved, and is going to my school again. so i decided to add her to my friends list. she gave me her number and we were texing. i asked her how she knew my boyfriend, and her reply was "long story." i then asked her if she ever dated my boyfriend and she said "all i know is that we both really liked each other." and she asked for his number. first i decided to ask my boyfriend about her. so i asked if he knew the girll and he said , "yeah, she is fuc*ing weird!" so i explained to him how she said they liked each other and how she wanted his number. he says, "ewww no!! dont give her my number!" i promised him i wouldnt. she wouldnt stop asking me for his number. so i suggested to my boyfriend that i tell her me and him had , maybe she would let us alone. he told me to do that, and i did. she still wouldnt quit. i found out that she is obsessed with my boyfriend, and she is pregnant. idk. what is your opinion?