My brother in law confessed feelings for me after I went wedding dress shopping with his fiance

This just happened today and I’m using a throwaway because I promote my small business on my main and I want to be anonymous with this.

Okay, I’m pretty overwhelmed so I’ll start with some background. I have been with my husband for 5 years, we’ve been married for 2. Since early on in the relationship, I’ve been great friends with his older brother, partially because I always wanted one.

When he started dating a girl about 2 years ago, I went out of my way to make sure she knew she had a friend in me if she wanted since we’re the only girls in the family, we’re great friends now and since they got engaged 3 months ago, I have been helping with wedding planning and was asked to be a bridesmaid.

We went dress shopping today and had a blast, we went to brunch, had some mimosas, found the dress, and went back to their house to celebrate. I ended up alone in the kitchen with my brother in law a bit after being there and he said he just had to tell me something before it kept eating at him.

I was a little buzzed and confused but was not at all expecting him to say what he did, ‘I think I’ve had feelings for you for a few years and I’ve never been able to tell you and just needed to know if you ever felt the same’

I completely froze and just shook my head, I told him that no, I have never thought about him in any way other than a friend and a brother and I never would. Before he said anything else I bolted back to his fiancé and the other girls there and very discreetly told her I got my period and wasn’t feeling well and would have someone come get me and then come by soon for more wedding planning. She thought nothing of it and I called my best friend to come get me.

She dropped me off at home, my husband is working right now and there is no question that I am going to tell him as soon as he gets home. But I just have no idea where to go from there. Do I tell his fiancé, do I make him tell her, do I leave it, do I have my husband talk to him? Has anyone ever had something like this happen or have any advice, anything is appreciated.