Wow, that is a MAJOR red flag. Anyone going to go that overboard, jump to conclusions, make accusations, all over a simple, reasonable question? There is something seriously wrong there.
I would like to caution you that this behavior can be an indicator of more serious problems in this guy. I know that so far the common assessment is 'poor guy must've been hurt pretty bad in the past'. Maybe that's true. Maybe not. Not all jealous people are jealous because someone has given them reason in the pasts.
-An illogical jumping to conclusions '(you're asking me to have male friends, so you can cheat' If you were going to cheat would you really say anything to possibly bring it to his attention?)
-Unfounded accusations 'not only that you want to cheat, but to go as far as have an idea in his head that you already have a man waiting for you at your house)
-High level of jealousy
-Manipulation and control (just by bringing up the subject of dumping you will make you drop the subject [manipulation] causing you to be more fearful of approaching him about things he may not like in the future [control])
-Angry outburst
This is a list of his reaction to your reasonable question. A question you went to him about to discuss with him, rather than going behind his back (something he failed to think about because he was too busy flying off the handle). While i'm not accusing him of anything, i will warn you these are all traits of abusive people.
Also, if you think this is the only thing that will set him off and cause him to act like this, you're probably wrong. This kind of behavior instills fear in people and shuts down communication. Even if he doesn't become abusive (and i don't just mean physical) ask yourself if you are prepared to spend your life with someone capable of being this way over a minor issue. Will you feel comfortable going to him in the future with other things? Will you have a lingering memory of his behavior next time you approach him with something he may not like (or even if you think it's not a big deal, such as in this case)?
Let me guess, 'he's never done this before'. Well, that's what everyone say the first time.
As i said, i don't know this guy, so i'm not trying to accuse him of anything. But my word of advice is be cautious. There is potential for worse than what you saw today.
And in case you're wondering, i have been friends with and helped counsel (no training) women who have been in abusive relationships. I have done my own research into the traits and behaviors of abusers. So i'm not clueless, i speak with some level of knowledge.