I don’t know how to cope

my fiancé and i had an huge argument las week, he left me bc we are in a long distance relationship. he was supporting that day like no other, we still love each other. the next day he called me and said that it was a mistake, that even when he had his insecurities due to the distance he was happy whit me. we are still together, my rational mind understand the situation, we talked to each other. but i still flinch when i see his name in my phone screen, i don’t want to hear his voice, i have been sick for a week now. i don’t know how to cope. i’m scared all the time and i hate this.