PSA that yes, a monogamous person will only date one person so Ruda is right in that sense, but Ruda is arguing in bad faith. What Ruda is actually trying to do is isolate Dan I from the people around her which is a tactic of abusers. To anyone reading this, remember that you have a right to spend time with other people and have friendships with people besides your partner! If your partner tries to lie to you that you can't trust your friends or does anything else to alienate you from them, your family, or others in your life, it is a RED FLAG and you need to RUN