I understand feeling insecure when other women are around your boyfriend, but here’s the thing. Other women can only “steal” your man if he wants to be stolen. He’s not a wallet you left on a table. He’s a grown man who makes his own choices. So the question isn’t really about these other women, it’s about whether your man can be trusted.
If he’s giving you reasons not to trust him, like flirting back, hiding his phone, or being secretive, then that’s a him problem and you need to deal with it directly. But if he’s not doing anything wrong and you’re still paranoid every time a girl looks in his direction, that’s a you problem that you need to work on.
Some women are just friendly or outgoing and it doesn’t mean they want your man. And honestly, acting jealous and crazy every time another woman breathes near him is probably going to push him away faster than any other woman could. Confidence is attractive. Insecurity is exhausting.
Work on yourself and your own self-esteem. Why do you feel like you’re not enough? Why do you assume every woman is a threat? You’re the one in the relationship with him, not them. Either trust him or don’t, but don’t drive yourself crazy policing every interaction he has. That’s no way to live.