Well sometimes they see text messages, find that the spouse comes home from work REALLY LATE, etc. Just little suspicions, and sometimes men are really cautious, like they're worried they're being cheated on, so everything is like suspicious.
If by spouse you mean husbands they were her two brothers. If by spouse you mean live-in lovers, they were Caesar and Marc Antony.
He may think that you are cheeting on him. You may have lied in the past
Hera didn't have any other real husbands. Although most of the gods had husbands they usually had kids with other people.
Yes
The plural of husband is husbands
Yes
she is not dating anyone and she gets mad when people think she is cheeting on someone well everyone does
Probably not; see a lawyer to be sure.
yes, if her spouse died
yes only if married at the time or unless if their credit cards no
The spouse is considered to benefit from the debt. Yes, the spouses share responsibility.
The brothers of your spouse are your brothers-in-law. Also, the husbands of your sisters are your brothers-in-law.