It's okay to feel some twinge of jealousy. That's sort of natural.
It is not okay to go batshit crazy when you see him with other girls. That shows insecurity.
Yeah, as long as you remain logical about it, and realise that talking doesn't necessarily mean anything else, then it's normal to feel that way.
It may not even be out of jealousy, simply out of knowledge that you can trust yourself to be decent but can't trust the other guy to.
But, sometimes even if you trust them to be decent, and you know they would never do anything, sometimes you can't helpfeeling that pang of jealousy you feel.
That would simply be the embodiment of the phrase 'love hurts'.
It also shows you distrust your boyfriend, because seeing that he could possibly be having fun/laughing/talking with any other member of the female gender somehow means you are now at risk of losing him. If he plans to walk out on you because of that, he doesn't deserve that.
doesn't deserve you* not that