He cheated and broke my heart.

I've been with this man for 8 years, gave him two beautiful children, built a life with him. He started talking to another woman and then later I found out he was telling her he loved her and wanted to make her his wife, he wanted to take her on dates and buy her flowers. Now he's begging me to let him fix it and stay together. Is there any way to come back from this? I'm so heartbroken. He hasn't married me yet he's telling another woman all these things.