Please help translate short message

[joe22]

Em that su khong biet se doi mat nhu the nao. Em suy nghi nhiet chuyen lam em khong xung dang de anh vi em ma nhu the dau

any help would be greatly appreciated.
Cam on nhieu

[justdoit]

Em that su khong biet se doi mat nhu the nao.
I really don't know ...(se doi mat... don't know what this is).. how


Em suy nghi nhiet chuyen lam em khong xung dang de anh vi em ma nhu the dau
i thought about it alot, i'm not worth it for you to do what you did

[joe22]

justdoit - Thank you very much for your help.

If anyone knows what "se doi mat" could be pls let me know. Thank you