Its tough somtimes people just make you Jealous. you can go on not caring then you meet someone. and they act a certan way and your like hmm. this is odd. because you dont think its normal and it does not make you feel safe.
i can understand your feelings. i would talk with him about it. let him know how you feel about it. and how it makes you feel. you have no problem in him having friend girls. as they say.
iv had girlfriends that had a lot of guy friends. sometimes people just get on better with the op sex.
iv always had more girlfriends than guy friends and my girlfriends use to have an issue about it. but i think youll find with your guy. there kinda like sisters
last thing on his mind is sex with them. that why he has you
i wouldnt be too upset about this
just make your feelings known and dont let it go on to long
Hope it works out for you
Regards