How would/or did you feel when a partner said they are afraid to lose you?

If a partner was really vulnerable and was honest about their abandonment fears regarding you. I. e. that they were afraid to lose you or they were afraid you were planning on finding someone better how would or did you feel. React or respond?

If you reassured them did you mean it?

How would/or did you feel when a partner said they are afraid to lose you?
How would/or did you feel when a partner said they are afraid to lose you?
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