AITA: Friend invited spouse; limit 10 people

SO and I are eloping. We are inviting 8 people only as most destination sites are a 10 person max (8 guests + us 2 = 10). The 8 people we invited are our parents, siblings, and my one friend who we almost adopted. She’s been a pet of our family & considered a sister for 10+ years.


My friend invited her spouse.. who doesn’t like us and talks about us behind our backs to other friends. I feel like a jerk for not wanting him there but consider her a sister. If he goes we will be over our 10 person capacity at the site.. I feel at a loss. I don’t know how to tell her we didn’t plan on him being there.. Any advise?
I don’t want to be a bridezilla but I truly feel like one. She’s been to many family parties & holidays without her SO & knew our plan. So it just makes any sort of conversation hard & awkward. Please put me in my place if I’m being crazy.