bipolar boyfriend ???

So me and this guy have been talking for a while. Before we started talking we were best friends. Now, he gets really mad at me if I want to go hang out with my guy friends, he knows me and my guy friends are JUST FRIENDS. I've known them since I was little. He will be mad one minute then the opposite the next. Idk what to do about it. He's really sweet and gentle so I know I don't want to let him go just yet...any tips on how to handle this? 😫