he cheated...

S • 16
My bf cheated on me what should I do, I feel so hurt and every time I think about it I'm in total disbelief. He promised me that he would never cheat. He's been cheating on me for 2 weeks with another girl. He didn't tell her he has a gf. She sent me screen shots of their convos and she told me he went to the movies with her and was kissing her all the time. He also went to her town to see her... I confronted him and he said it was a mistake and that he loves me. My heart is broken and I love him, I don't know what to do Next.