Advice Needed

My boyfriend of five years (and father of my daughter) just told me he cheated on me back in December of 2017 while I was in Las Vegas with my mom, sister, and our daughter ( she was a month shy of two). He said he met a woman while at work and he slept with her. He claims it only happened once and it’s the only incident. I want to leave him but he is asking and begging for another chance. I’m trying to hear similar experiences so I can get some guidance. We do live together, share vehicles, and raise our three year old daughter together.