Why do I feel so bad about visiting my lesbian friends without my boyfriend?

I got invited to my lesbian friends house for the weekend for a sleepover. I feel so bad about not asking if my boyfriend can come along. I feel so anxious even thinking about it and I feel like I should bring him everywhere... Should I ask him to come or just enjoy a girls night with my friends?
Why do I feel so bad about visiting my lesbian friends without my boyfriend?
Post Opinion