I agree with @LikeMindedLady MN opinion is so often stay and put up with it, or leave, and it’s so wrong.
Non-monogamy is not for everyone, but it works brilliantly for some.
OP, I was exactly where you are 12 months or so ago. I had bottled that part up of me for as long as I could, but the more I tried to put it out of my mind, the harder it became.
My DH and I are in a very good place and we talked about it one night. He had always known I was bi, so that bit wasn’t a surprise. And actually the fact that I wanted relationships with women also wasn’t particularly a surprise. He knew all my fantasies were with women, and his view is that it’s not a sexual need he can fulfil, so he is happy for me to look elsewhere. And not only happy, but actively supports and encourages me.
He sees it as my ‘hobby’. I go to new places, meet new people, have lots of interesting experiences. Those experiences just happen to involve sex!
Our relationship is unbelievably strong, and if anything this has improved it. I’m not saying everyone’s husbands would react like this, but only you know yours!
I didn’t make the decision to get married for stability, I got married because I love my husband, want to spend my life with him, and share all the ups and downs along the way. That has not changed at all, and he will always be my primary relationship.