'16 & Pregnant' Star Whitney Purvis’ Ex Hopes Arrest Is Wake-Up Call She Needs

Whitney Purvis' babe daddy is speaking retired astir his ex's apprehension for involuntary manslaughter -- saying helium hopes this volition beryllium a turning constituent successful her troubled life. Purvis' ex-boyfriend Weston Gosa tells TMZ ... helium hopes her apprehension "will beryllium the…