I want to go up north with my friends without my girlfriend
Is there a reason to go without your gf?
Yes, I'm tired of having to deal with her bossiness.
I understand how you feel, but I'm not sure if it's right to not invite your girlfriend as well. She might be upset if you exclude her. If you're upset by how she's acting, you should talk to her about it.
Well I'm going up north with my friends anyway.
I just think she might be upset when she finds out you went on a trip without her. If you want to go with only your friends then you should let her know, and maybe plan a trip for just the two of you for a later date.