I need advice for confronting my husband.. 😶

Hey ladies !
I need your help .-. 
I'm the most non confrontational person ever... 
I rather just hold in issues and just let them fester and bother me until I blow up about it basically 
But I usually try and do it over text so I don't have to really confront the person face to face..
(It's stupid, I know but I just can't .-.)
When my husband was moving into my house (5 months ago) i helped him pack his things and move. In his trunk I found a notebook from AA, but at first I didn't know what it was for and I opened it and went through it - I found a page dedicated to like the sexual partners you've had.
I do not judge how many people he's been with before me , for I have a dicey past as well. 
But I noticed a name on there that I know the female. She's dating one of his friends off and on for 4 years. 
He'd go over to their house after work to smoke and hang out while we were dating almost all the time
And one day he told me we should chill with them and we can all hang out and smoke , he said I'd probably get along with her and we could be friends 
Which fine, I was down with it because at the time I was not aware that they had slept together. 
He ended up going through her to get his insurance and all this stuff (I was there for that too- still not knowing of this ) 
So after becoming aware I got upset because I've hung out with her with out knowing she's slept with my boyfriend at the time.. and he's had me around her. 
It made me feel uncomfortable..
Well on our baby shower she was texting him to see if he can go and drop off some weed for her and stuff but he never answered since he was busy 
Apparently her and her boyfriend broke up and they aren't really on the best of terms but they talk 
So my SO goes to me about a week ago oh  *woman he slept with * messaged me saying she can get me a cheaper insurance rate if I see her as soon as possible 
Hearing her name honestly pissed me off so bad and I'm blaming it on my hormones :( 
Then he said oh my friend was telling me that she was asking him why I've been ignoring her and not messaging her.. which annoyed me some more.. 
So I'm just asking how do I confront him about me knowing about their past and that I don't want to be involved when he has to go do things for insurance and so on.. I don't want him to have any form of relationship with her tbh.. 
*UPDATE* 
She was asking her ex boyfriend why my husband has been ignoring her and not messaging her back to his messages 
And he's not in AA anymore, he's not drinking but he smokes weed when I'm a social gathering.

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