why do you think about the 2nd chance? why don't u open your mind and soul 4 s/one else whom could be the 1st chance both for her/him or yourself?

try to look from the other side of your fact ...

the failure of the first has definitely a reason why it happened, there is some meaning of it .. it might say you or him/her are not in good shape of relationship for the future, likewise it can tell you that if you meet or find a "replacement" - sorry may this not as appropriate term - it can the best things for your entire future life ..