Also sounds like a bit of projecting, what does he get up to on these nights out that he doesn't want you to do?
Yeah, I was suspicious too.
I have no doubt that if you raise him not trusting you (with no reason) he'll hit you with the controlling man's classic line;
"I trust you, it's other men I don't trust".
That's a favourite.
Well, here's the thing - unless they rape or sexually assault you, or at the very least lunge and plant a kiss on you (none of which would be your fault) you have to actively participate in order to flirt, kiss, have sexual contact etc with another person. Absolutely nothing can happen beyond a civil brush off unless you participate.
Don't doesn't matter one iota that men might assume you're single, or eye you up, or try to flirt, or try to pull you etc etc etc. That's their issue. A short convo (if you even have to have a convo) will deflect them.
You can't not go out, just because men might look at you, or try to flirt etc with you. (If we follow that path to its conclusion we'll be living in a fundamental state, not allowed out anywhere without a chaperone, wearing a burqa, niqab etc.).
Then there's the implication that you are silly, influence-able and lack independence and judgement. Is he projecting? Is he saying you personally are like that (insulting and no doubt unfair)? Or all women are like that (making him a misogynist)?
He's allowed to go out with his mates, right?
At any point women could try to attract their attention, or try to flirt, or chat or whatever. But he's still allowed out. And he doesn't get a warning that he'll be contacted if his child doesn't settle well that evening, or have it implied that he's a bad father if he doesn't want regular updates on how his child has settled, he doesn't get sulks and moods and guilted about it
He's apparently able to not flirt (?) so is he saying he's superior in morals, independence, and judgement to you?
Even being told by his own mother that he's out of order hasn't stopped him with this shit. That's a problem.