Well, yes it changes everything. Maybe not for you, of course, but for millions of heterosexual people who signed up to be with another heterosexual person, not bisexual or homosexual, this would change a great deal.
However, back to you.
- Anyone can leave any marriage at any time for no reason or any reason.
- Anyone can find a person unappealing sexually at any time for no reason or any reason.
- Nobody ever needs to offer any explanation as to why they find someone sexually unappealing.
- It's not remotely phobic to find anyone sexually unappealing for any reason or none.
- It is however deeply phobic and coercive to try to slyly insinuate that a person doesn't have a right to find anyone sexually appealing or unappealing for any reason or none.
- Some people try to act coercively and pretend that heterosexual relationships are lacking, they often use words like "vanilla" to try to be slyly derogatory towards heterosexual people. Those people are bigots and coercive.
- If you no longer find your husband sexually attractive that's absolutely fine - not phobic, not bigoted and not wrong in any way.
- You do not owe your husband your body, your rights, your life or your support.
- Your husband has completely changed the terms of the marriage you agreed to, so you must now renegotiate your terms.
- You are allowed to simply dissolve the marriage if you wish to on this basis alone - and you are in the right if you choose to do so.
These statements can't be argued with, they are irrefutable.
Some questions you probably need to ask yourself.
- Why is he telling you this now?
- Has he been hiding this from you all along?
- Has he only just realised this and if so, why now?
- Is it possible he wants to fuck men?
- If he wants to fuck men, are you ok with this?
- If you are not ok with him fucking men are you willing and happy to lead a sexless life and just stay together as friends?
- Why are you more concerned about supporting him than your own feelings?
There's a LOT more to consider of course, but much depends on your answers to these.
Whatever YOU decide it is entirely up to YOU.
You do not owe your husband your marriage, life, body or relationship or your support. He has completely changed the terms of your marriage.
You did NOT marry a bisexual man. You married a heterosexual man.
Anyone who pretends this is unimportant or has low importance is a) a liar or b) without any understanding of how most humans operate.
Anyone who pretends anything I have stated is unfair, unkind, phobic or unclear is being a) irrational, b) coercive or both.
Good luck.