in my experience i have found that after being cheated on i can never feel right with the person ever again. i can still love him but i can not forgive or forget and it caused me to put up walls to keep him away from my heart. i have been in this relationship 6+ years and it has been four years since i found out. i didnt leave. but i can tell you that i wish i had. it has been nearly impossible to trust him. now i have so much resentment towards him bc it has bothered me everyday for so long now. once that trust is broken it can not be 100% ever again.