i thought he meant nothing to me..i made a mistake

i thought he meant nothing to me i guess i was wrong.my heart is breaking what have i done?my heart is a heart of pain it has never been able to love after him..i played with his emotions & left him torn what got into me?what was i thinking?he has someone now who loves him dearly but deep down inside i know he still cares about me.wouldn't it be wrong to destroy what he has now?!will it be another mistake?my actions were falsely justified by selfish proud thoughts-i thought i had so much potential ,i thought i could do better ,i had my own description of a man & love i was too proud.how was i to know that one selfish little mistake will come back to haunt me with every breath i take? they say to err is human to forgive is divine but why do the errs always have to be mine...