I'm thinking of proposing to my girlfriend with a ring I originally gave to my ex-fiancee
Does your girlfriend know the ring's history?
I told her about the ring before. She doesn't know how much it means to me though.
Knowing that the ring means a lot to you, I can understand why you want to propose with it. Just be sure to explain that to her if she asks why you're giving her the ring you gave your ex.
She is a fool. I gave her a charm that my mother gave me. Even if she leaves me, I will have the charm.
I understand re-using a ring that has a lot of meaning, but you shouldn't call your girlfriend a fool or give her things that are meaningless. If you intend on marrying this woman, you should treat her with respect and be honest about what you are looking for.