girlfriend lied about birth control and ruined my condoms so i wouldnt leave for college

im 19m and supposed to move away for university in like two months my gf 18f and i have been together for about a year when we started sleeping together she told me she was on the pill but i still made sure we used condoms every single time just to be safe a few days ago she tells me shes pregnant i was shock and when i confronted her about it she broke down over text and admitted to everything turns out she stopped taking her birth control months ago without telling me and she literally used a safety pin on the condoms kept in my nightstand drawer all so i wouldnt leave her for school i saved all the screenshots where she admitted to doing this on purpose im terrified right now and i dont know what to do i dont wanna be in this relationship anymore i dont know how to say it without hurting her and my classes start in a few weeks