Cheating..

I just had my daughter about two months ago, the father and I have been together for almost two years in a few months, I had just found out yesterday that he had cheated on me with his ex last year she had said they kissed.. Before that he had cheated “ flirting “ with another girl over text I stayed and worked on it with him that time but I said if he ever did anything again it would be over.. I know I can’t stay because we have a kid together but I’d like advice.. I’ve been really emotional..