AITAH For not wanting my husband to sleep in the same hotel as his so called 'work wife'

My husband travels a lot for work and I recently found out one of his coworkers calls herself his 'work wife' my husband was the one to tell me about it telling me how he wasn't really comfortable with the name but deals with it since he doesn't want to upset her.

I won't lie hearing him say someone is calling themselves his 'work wife' really pissed me off, even though I know I can trust him it makes my blood boil knowing there's a women who's at his workplace who definitely knows he has a wife is calling themselves his 'work wife'.

My husband has to go on a trip for work and he had told me that he has to share a room with her let's just call her Jenna, I told him that I wasn't comfortable with him sleeping in the same hotel room as Jenna and he assured me that it would be fine, I trust him with my life so I let him go. I feel like I shouldn't be jealous it's such a stupid thing to be jealous about. Am I the asshole?

Edit: thankyou everyone for so much support since I'm basically finding out my husband might be cheating on me I won't be on for a while just too relax a bit before he gets back and try to process everything, I will update when I can thanks so much.