lovesick the original?

i heard a song on a tv show called "the voice" kind of like american
idol they had to sing an original song so it had to be around for a
while it went "i should've never giv'in up on you thought maybe this
time you'd make me better but now my heart is beating (bleeding)?
black and blue its funny how your try'in to stitch me up now i'm
lovesick lovesick i'm sick of love" can someone tell me what its
called and who its by? please and thanks