Is it okay for another married woman to ask your husband to smoke together?

Dear moms,

My husband is a teacher, a friendly person and has female acquaintances. He doesn’t hang out per se but people contact him regarding his expertise, work but I’ve noticed this one woman he’d mentioned sometime back. He told me she was married and a nice person and we were from the same state.

Last night, she sent him text late night which also makes me believe he’s deleting the communication. This is because I see her response but don’t his previous communication. She’s saying she’d be up to have my husband to take her to this British pub which is his favorite place. I’m also wondering why he’s not also asking me to go. Would it make you uncomfortable or is it just a friendly thing since she’s married? How would you handle it?

Thanks