Most Helpful Girl
You need to call her out on it and talk to her. Think about how this would affect a marriage if you were to stay with her. Has she created a habit of doing this? Would she feel no shame cheating like this again?
Don't let yourself and your feelings be manipulated by someone with so little respect and care. Address the issue before it's too late and more damage is done.
Hang in there.
Most Helpful Guy
Kick that bird to the curb. Or find a new girl to fuck while u fucking her and break up before her stag