My wife came out to me as bi after we got married so we are in a straight presenting relationship. We are still in a monogamist relationship and from an outsiders perceptive nothing has changed. But for us internally its different but overall much better. Her honesty has let me explore portions of my own sexuality away from the heteronormative assumptions which has been great. We are both more open and honest since the whole experience. It started with mall things like both admitting that the actress in a show is hot but it was a prompt to be more open about everything in our relationship from kink, monogamy, jealously etc. It is totally worth it from my end as a spouse of a bi women. We aren't out here having threesome constantly but that doesn't mean she still isn't bi.
From her standpoint she has been coming out to her friends and family and most people are supportive. There was a one big fight with one of her
"friends" who didn't understand why she was saying that she was bi now. This was hard for everyone.
However, the disconnection from the rest of the queer community since she is an straight appearing relationship is hard. She has said that she wishes she had more friends in her situation. The ironic situation is since she is a therapist is that a large percentage of her clients have come out as bi in the exact same situations as her. They are all women is happy relationships who are bi with straight male partners. They all feel the same way and she is even starting a therapy group for them to talk about their situation. So you are not alone in this situation and coming out you might find some friends who are in the same situation.