Made my boyfriend cry

Today me and my boyfriend got into an argument and I shut my phone off to calm down after the argument ended and just tried to calm down . Well he ended up texting my mom telling her to tell me it text me back and when I answered the phone he started balling his eyes out like for a minute straight telling me he was so worried about me and he couldn’t even talk because he was crying so hard . It hurt me so bad to hear someone I love so much hurt. It’s been like 4 hours and everytime I think of the sound of him crying I cry . It hurts me so much to even think of him crying . Just like remembering his voice breaking and crying it’s hurts so so much. I just want to go back and wish I never turned my phone off. I feel like a terrible girlfriend.