Can some one tell me what to do ?

So I was goon out with a girl she is 16 I am 17 both same grade 10th and I really love her and she broke up with me it's only been a week and she said it was cause I said I love I know it was to early to say that but this is to much for me to handle so o have to say this I want to go back out with her but idk what to do it's like I feel so sad I have never felt like this my whole life and now it feels like I can burst out crying a river but I try to hold it back and now almost all the song I hear are love song about girls breaking up ex murs atmosphere and etc it's just so hard I want to ask her back out can some one please help me before I kill my self no joke I feel close like doing it this is the second time I felt lovesick like this the first time I felt lovesick was when I was 15 and nohing happens she moved away but this girl is in my class I feel so stupid and now I'm so sick throwing up and trying to hole my emotions please help