Should i wait for the crush to pass? or tell my husband and explore?

Here’s a little background on my relationship with my husband. My husband and I have been in an open relationship for over a year. We use to be more actively searching for separate partners, but lately we’ve really slowed/calmed down about it. He was looking for a woman to date separately, and I was also looking for a woman to date separately. He never went further than a couple of first dates, and I had a girlfriend for about 6 months. I identify as graysexual, somewhere between asexual and “normal” sexual; my sex drive is low and I prefer romantic relationships over physical ones. His sex drive is high. This is what originally lead us to open our marriage; I wanted an emotionally romantic female partner, and he wanted someone he could be physical with, but also have a romantic connection with. It wasn’t until recently that I’ve been more interested in men, specifically a very close male friend of mine who is also in an open marriage.

I don’t exactly know what it is I want from this friendship. Friendship itself has been great. I consider him a best friend. I can’t help but feel guilty about it, though. I have the type of relationship with my husband where I could easily talk to him about this, but I don’t want to put the thought in his head that when I’m hanging out with this friend, he has anything to worry about, because he doesn’t. I’ve had innocent crushes before that I’ve told him about, and he’s been fine with it.

So I guess my question is:
Should I just write this off as an innocent crush and not tell him about it? Just wait for it to fade away like the ones in the past did? Or should I tell my husband about it and hope it won’t plant a seed of questioning in his head? I don’t honestly know if there’s any feelings strong enough to act on. It’s been tearing me up lately, and I guess I’m just hoping a stranger on the internet will give me some insight. Hoping it won’t just be a bunch of people saying “yOu ShOuLdN’t FeEl ThAt WaY aBoUt OtHeR pEoPlE”

If you read all of this, thank you.