Your boyfriend probably had some female friends before you started dating him who would be pretty put out if they lost a friend just because he got a girlfriend.  Shutting people out of your life just because you start dating someone is not healthy.  A completely exclusive relationship hurts the people on the outside of it.  Maybe if you spent more time with his female friends, you would feel better about him hanging out with them.  You could even acquire new friends for yourself.

Your boyfriend does need to be careful with his female friends.  If he is not careful, he may start developing feelings for them and thus hurt his relationship with you.  Make sure you guys are open with one another about your external relationships.  You may want to help him set up parameters like not being alone with other girls or cutting back on flirting or touching other girls.  If he is sneaking around with other girls and not telling you that he is spending time with them, he is probably up to no good.  As long as he is open and honest, everything should be okay.  Do you trust him?  If not, you need to delve into those deeper issues and solve them from their core rather than just worrying about him spending time with girls.

How would you feel if your boyfriend didn’t let you have other male friends?  He would seem really controlling, right?  Although you may be attracted to the feeling of control over your boyfriend’s life, that is probably not the healthiest way to go about having your relationship.  A healthy relationship includes trust, honesty, communication, respect, and caring.  Worry about working on those things rather than worrying about your boyfriend’s female friends.