Should I tell my husband ?

My husband and his BM are on okay ish terms. Back then ( way before I was in the pic) her family and his family were I guess to involved in there problems. So now no one likes each other.

My step daughter and I went to the bank and she seen her grandma there. I told her she can go say hi if she wants too and she did. I had finished my stuff and looks that way so she can know it’s time to go and her grandma waved at me and waved for me come. I did and greeted the grandma and her boyfriend in there car and she just told me nice things like it’s nice to meet you and she is glad there is someone like me in my step daughters life to take good care of her when her moms not there. And I told her it’s nothing I do because I care as well. Her boyfriend of many years spoke in and said we never did anything to (my husband) idk why he is like this. I blanked him out though. Idk why he would have the need to say that. But at the end it felt good just communicating with my step daughters grandma because she is a big part in my step daughters life too.. my step daughter felt weirded out because she knows some the drama now as she is getting older. Anyways we got in the car and we said we wouldn’t tell her dad because we wouldn’t know how he would feel about that.. but a part of me wants to be honest but apart of me just says let it go..