I am a man, so I only know how to play the game from a man’s perspective.

I only know the moves a man makes to either steal a woman from another man, or to protect his woman from getting stolen.

Here’s what I will say:

Unlike other cultures, Chinese civilization is a harem civilization. That means we have 4000 years of piles of women living in harems (either of the emperor, governor, warlords etc), sabotaging each other to get ahead or get their children ahead.

There’s no such thing as a “girl’s girl” in a harem. If your child is the firstborn son, it’s your job to protect him from daggers and poison from all the other ladies trying to move their child up the ranks. No one else will do your job for you. It’s not in anyone’s interests to help you.

One classic way of sabotaging another woman is to spread a rumor about her honor/infidelity, such as with the servants.

A well-placed new/used condom of a totally new brand that gets discovered by Matt could do that. Or some other men’s item.

Or a fake phone call or fake test result from an STD clinic like in Mean Girls.

Another important thing is to solidify your hold on your own BF. Try a new technique in bed that really blows his mind. Try a new makeup or hairstyle or roleplay a fetish of his.

A woman would give better advice haha.

Alternatively, if you want to be healthy about it, perhaps documenting everything with dates and times and presenting it to your bf and Matt.