How do i over infidelity which my boyfriend has put me thru. v both want 2 b 2gthr, how do i over d pain?

my boyfrnd recntly told me dat he had startd liking sum1 at his workplace. bt he wants 2 b back wd me, as he ws ashamed fr it. i 2 want 2 b wd him, bt how shud i overcome my feelings of anger, betrayal, helplessness