There are people who are bi because they have been attracted to someone who is nonbinary. 

There are people who are bi because they’re nonbinary.

There are people who are bi because they want to acknowledge that it’s possible they could someday be attracted to someone of another gender than they usually are; that regardless of their history, they are open to all possibilities. 

There are people who are bi because they are only ever interested in one gender, but at different points in their life the gender they’re attracted to has been different.

There are people who are bi because they are attracted equally, or similarly, to men and women, or equally or similarly to all genders.

There are people who are bi because they are attracted in totally different ways to all genders.

There are people who are bi because they’re attracted in totally different amounts to all genders.

There are people who are bi because they’re attracted in totally different ways and/or amounts to more than one gender.

There are people who are bi because they’re attracted in the same or similar ways to more than one gender.

There are people who are bi because they’re attracted the same amount or similar amounts to more than one gender.

There are people who are bi because they don’t believe in the gender binary.

There are people who are bi because they are attracted to the person, not their gender.

There are people who are bi because they are very attracted to gender – to more than one gender.

Am I forgetting anyone?