some please help

i've been unbelievably sad this past week. i told my boyfriend of a year and a half that i needed to take a break a little over a week ago. i can't help but constantly doubt myself and wonder if i did the right thing or not. i know he can find someone who treats him better and i thought maybe i could find someone i'm more compatible with as well. but we were so close and it hurts to not talk to him anymore. i've cried almost every night and i'm just mentally exhausted from thinking the situation over and over. can someone please just tell