My world is burning

Not to be dramatic but my boyfriend and I have been together for almost 8 years. We just had a baby and he will be turning 6 months old soon. A few weeks ago I discovered that he had cheated on me. I found him on tinder. He was talking and flirting with multiple women on there. He also asked them for their snapchats and their phones numbers. He wouldn’t show me his phone so I had to become an FBI agent and I hacked his account and saw his profile and everything. I can’t believe it I wanted to pass out and throw up. I gave this man the greatest gift I could ever give him and he goes and cheats on me. My immediate response was to leave him and never look back. But I just can’t gather up the strength to do so. I also think about how my son’s life will forever be Impacted by this. I just don’t know what to do.