Trust him/herself whom you love because if you left her/him with a pain given by her/him is not a solution, solution is that is she/he realize or not what she/he done with you,
If they realise their mistake even though they hurt you a lot but once they realise their mistakes then give them a change otherwise may be you can't find someone who loves you more than her/him so love her/him and be haply with your new life😄😄