Ma lady just cheated ion me i dont noe wat do?

she cheated on me b/c i wasnt taling to her for a while but the reasin was b/c i was at the hospital and i wasnt felling good and just today she asked me allot of question and she finally decided to tell me the truth that she cheated on me w/ her stupid ***** *** ex lady and i seriously hate her!!!!and i dnt noe wat to do like should i stay w/ her or should i break up w./ her????