I'd be concerned that his profile is still up but explain why it bothers you before making a final decision. My BF was new to the online scene and I don't think he'd given much thought to the 'when does one go exclusive' question. Some guys are adamant on "once sex is involved". That's how I am. But my guy really hadn't thought about it. His first reaction was that having sex does not determine exclusivity. So after I walked him down the path of what could happen, he agreed with me. I said stuff like:
"What happens if you have sex with one girl, then meet another and like her too and want to sleep with her? What will you tell her? What will you tell the first one if you go ahead and sleep with the second one? How are they both going to feel? Is the first one just in your hip pocket as you keep looking? How would you feel?"

So...I suggest you have the discussion if you haven't already. And make sure you ask him if he's monogamous. If he's not and you are, you know what to do.

My bigger concern is the comment "Waiting is stupid". Sounds like he pressured you into having sex. Sounds like a lack of maturity or he just doesn't know any better because nobody's called him out on it. Or maybe it was just a dumbass comment when he was drunk and horny. But I would calmly and non-judgementally explain how all this makes you feel and see how he responds. If he is defensive, stonewalls or makes you feel bad about it, move on. If he is apologetic and sympathetic then OK, give him a chance. But the profile has to come down or he's just not sincere.