I Have a Question

My significant other of 10 years has been cheating on me since day one
I’m fed up with the bullshit so I left him yesterday
Within hours he sleeps with someone else unprotected.
Now my question is what do cheaters do?

Cause he’s found every reason he can to blame everything on me
Some how things are always my fault.
I’m just lost because I’m trying to figure out why everyone knows I need to walk away except him. He feels like he’s this great thing imma regret losing.