Boyfriends going out to bars.

Does anybody have any issues with their boyfriend going out to a bar without you for a "guys night" I have extreme trust issues. My boyfriend and I have been together for almost 2 years and this has been our struggling topic basically when the topic comes up with him going out we get into a weeklong argument and then when the night comes I'm usually just a bitch to him for no reason really I have even gone to the point of not hanging out with my friends to avoid him feeling hurt like I do because he feels the same way I do about it. It makes me feel extremely hurt and sad all at the same time. I want to be okay with him going out and not feel worried or sad or anxious.  This is probably the worst thing I have ever gone through.  So advice please