Hi, i had a question about something that came up in my previous relationship. This phrase was said a couple times and i definitely know its not the responsibility of someone else to fix someones hurt feelings..but the way it was used seemed kind of wrong?

Example: her bf and her had a policy and she told me she thought about just going behind his back and i said wouldnt that hurt his feelings? And she said this phrase to me. She did end up doing this and did it with someone else that wasnt either me or her bf and it hurt both our feelings.

My question is at what point are you responsible for other peoples feelings? This seems like abuse of the phrase to me