There are no signs. If you are bisexual, no one will know for certain unless you tell them.
'I'm bisexual'
Same way you can tell if a straight man likes a girl. Usually they would admit to it, it act like they have a crush on that person
Whether or not the man is bisexual is not really an issue. A bisexual man can be just as monogamous and faithful as any other type of man.
Well, think about it. Man- Bisexual, so can have either man or woman. Woman-Bisexual, so can have either man or woman. The man can have a woman. The woman can have a man. Therefore, they can have a "straight" relationship.
This man speaks for himself!
First of all, sexual orientation is unchangeable. If a man is bisexual, then he will always be bisexual. Secondly, a bisexual man is by definition fully capable of loving his wife and being attracted to her. But if the man is actually gay, then that is a different matter altogether.
If you fall in love with and is sexually attracted to both genders you are bisexual.
Obviously
You ask her.
As far as I could tell, there is no indication in any of the ten main novels about him being bisexual.
There is only one way to tell: you have ask her.