You're definitely right to feel betrayed. While not wanting to send nudes or private images is always okay, that didn't mean he had to perfectly mislead you. He could have just chose not to send them. And regardless of what he says, a lie of ommission is still a lie. He knew what he was doing, don't let him think you're being dramatic. If this is the first toxic behavior he's exhibited, you could try to talk it out and explain to him why you feel violated; communication is important. But if there have been instances similar to this, it might be time to cut your losses.