Is it ok to hang out with guy friends when you have a boyfriend?

Jealousy is a bad sign. You cannot train a boyfriend to be less jealous or hope it goes away. Jealousy can be just a pain in the *** or it can lead to possessiveness. You should be free to be with whatever friend you like. Tell him this is what you want and expect (and let him do the same with his friends), and if he cannot handle it, consider replacing him for someone who is more understanding.