How would you feel if your partner said if you and them didn’t work out , they tell you who they would go for next?

Girl I am with , said this to me and I was a little upset by it considering it’s like she already thought about being with this other person, and i felt disrespected, I told her how I felt and she said I have to stop being insecure , I said it’s nothing to do with insecurities , I said it’s just straight out disrespectful, and I said , How would you feel if I told you I was going to go for this other girl if you and i don’t work out? What was her purpose of telling me this shit? How would you feel if your partner did something like this to you?
How would you feel if your partner said if you and them didn’t work out , they tell you who they would go for next?
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