This is why people should work on their insecurities before they demand reassurance from their partner. Honestly I'm sick of all the authors who use this plot twist of someone random appearing after the main couple get together and makes the insecure main character find reasons to end the relationship. Like if you don't have the power to fight for your relationship and want the other person to beg you to stay, then I don't know if they are really ready for a relationship. If the authors want to give obstacles to the relationship, make it more realistic. Not some random gaslighting, attempted assault like this. Its a criminal offense but I bet that the main couple would let them go for a dumb reason.