paramour
partner, girl/boy freind, or if married, wife/husband.
A person who is engaged to be married is a fiancé if male or a fiancée (note the additional e) if female. Both words are pronounced identically.
Such a person would be an accomplice or a partner in crime.
The Bridegroom.
A person who is about to get married is typically referred to as an "engaged" individual. This term signifies their commitment to marry their partner and is commonly used in both legal and social contexts. Additionally, they may also be called a "fiancé" (male) or "fiancée" (female) to specifically denote their betrothal status.
A hacker is a computerphile who uses his expertise for illicit access.
Illicit Trade
a female who isn't married is Mademoiselle
If they call out another person's name that you aren't, also if the person is acting weirder then usual.
A person who is not married to a woman but has sexual relations with her is called her lover.
Grammar has nothing to do with it. You should know a 'partner' well enough to know what he, she, or ze wishes to be called. If you don't know your partner's prefrence, then you should re-evaluate your relationship with that person (you're not as close as you thought).
Sadly you can't call your partner on Tenchu Z itwould be good if you could but no.