Leave or stay?

Would you leave your significant other if you found out that they were having an emotional affair and a small physical affair and what I mean by that is just kissing it happened five different times after the fifth time she told him no I can’t do this anymore I’m married. I’m sorry, but she never told me about it. I found out about it by sneaking on her phone. So now I feel like all she is going to do is lie and hide things for me.