Am I just being crazy?

So, my husband and I have this friend that originally used to be my best friend. We were super close in high school but after school ended a lot of things happened and we ended up loosing touch. A couple months ago she came back into our lives and since we’ve been back in contact and hanging out with us, my husband is always down to hangout. Even if I’m not there. I don’t think he would do anything, I trust him completely (also he works for my dad and comes home as soon as he’s off so it’s not like he has a lot of free time to really do anything I wouldn’t know about) but she has had kind of a past of cheating on her boyfriends or cheating with men in relationships. I don’t think she would do that to me, but still the thought doesn’t leave my mind. Would this upset you? I don’t feel like I’m overreacting, but maybe I am? I just feel like personally since she was originally my friend, he shouldn’t be hanging out with her alone because that’s like my friend? I don’t know. What do y’all think?