They expect you to do absolutely nothing about your needs. Don't even ask. I've always asked women, "If you're not going to fuck him, who's supposed to?" and they have said, "Nobody is!" followed by ranting and cursing and "he better not" kind of shit but then, on the other hand, they wonder why he'd cheat on her and "worse," why he'd choose to sleep with a guy.
Everybody has needs, and a married couple should need each other. Rather, a married couple should want each other. If they don't, something's wrong and they need to put serious effort into putting fire in each other's hearts again or they need to go their separate ways and figure out their own thing. Not that I'm saying an open marriage wouldn't work either. But those can be challenging and that's better as a choice for its own sake not as a solution for a marital problem. Or so I hear.
Can an open marriage be a solution to certain marital problems? Yes. The problem is that most people don't know how to do this without fucking up the foundation that is their marriage; it's supposed to be about us and not just me. Can it facilitate those who have a bisexual need? Yes. Can one be pushed into this? Yes; my first wife pushed me into being open because, bluntly, she needed pussy, too. Worked out nice for us and for well over twenty years. I know I wasn't the only husband pushed into being open by a wife who had this need. Anyway. A married couple should always want and need each other but, um, if the want and need is in the form of same-sex, it's like I've told many a woman: When I need some dick, baby, you don't have one. The need isn't going to go away; I'll take all the pussy they want to throw at me but I still need to suck cock and I will be a miserable son-of-a-bitch until I can do that. How about you guys?
When I was with my girlfriend, my almost 25+ years of strong desire for other men clearly didn't wane. Whenever she broke up with me during the 3 years we were together, which was a lot, I went absolutely crazy with gay porn, though I held off hooking up with guys for some stupid reason. Meanwhile, during our many break sessions, the longest of which was about 5 months, she was always fucking other guys, exactly what I should've been doing. Hell, she was even looking at engagement rings with one guy during that 5 month period. But then she would always come crawling back begging me to take her back, and I was always so stupid to do so. When finally I could no longer cum while fucking her without imagining it was a guy's ass that I was fucking, I knew that I just couldn't live without men. A few months later I broke up with her, just before Covid hit (dammit), and that was final. At 63, I now know that it is greatly unhealthy for me, both physically and mentally, to go without cock and male ass. This isn't just about gay lust: this is about who and what I am, and a primordial and emotional need. If I were ever with a woman again, and I don't really want to be anymore, she would have to understand this. I doubt this would even be possible (or least very rare), unless she was very bisexual herself, and thus understand that deep same-sex need.
Not that you're necessarily looking but I'm sure there are women, no matter if they're bi or not, who are willing to let their boyfriends/husbands have a gay life on the side. Not everyone believes in the patriarchal one man/one woman for the rest of your life only model of intimacy. Not that there's anything wrong with it at all but it's wrong to impose it on everyone, and to assume everyone wants to live it.