CaliButterfly as a long -time married person (39 years), I'd urge you to take a deep breath and stay calm and don't drink. You're coping with recovery at the moment, that's your focus but the stresses and strains of early recovery can make us super sensitive.
You need to meet this friend of your husband's at some time, at the moment you are shadow boxing with an imagined person in your mind. Explain to your husband that you want to meet this long time friend and invite her to your home so you are on your turf. By the sound of things this will need to be the next time she is in your town.
Be honest with your husband, tell him you're curious, you do feel a smidge of jealousy and it would be so much better if you could all meet over a meal in your home.