Most Helpful Guy
Yes you should leave him and do it fast. The guy sounds abusive, controlling, potentially violent, borderline mental case. Not to mention a total asshole.
Leave him. Make sure you tell some friends that he has threatened you. If he doesn't take it well, you might try to get a restraining order.
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Most Helpful Girl
OMG wtf, he's THREATENING YOU. Like I get that you shouldn't cheat, and anyone would be unhappy, but I don't think this is okay at all. I would leave before anything actually happens, because I can see him easily being the type of guy that one day will start yelling at you about something that you didn't even do wrong.