Is this a trick question? No, he won’t cheat on you, because you’re gonna boot his sorry ass before he gets the chance. At least I hope you do.
Your boyfriend — how can I put this delicately? — he’s a f**khole. Seriously. Why on earth would you put up with that behavior? A guy who talks openly about getting busy with other women has zero respect for you. A guy with no respect for you will do anything he takes a mind to do, whether it’s cheating, lying, abusing you, whatever pleases him. Why? Because he couldn’t care less what you think or how you might react.
That you’ve stayed with him in spite of this behavior has only empowered the guy, so it’s just going to get worse. I’m not saying that his douchebaggery is your fault, but you haven’t done yourself any favors by letting him get away with it. You could tell him how you feel and ask him to stop, but I think it’s too late. I don’t see him changing. I’m not sure he’s even worth the effort.
If he won’t respect you, respect yourself. Cut your losses and dump this ass clown like a black bean burrito.