What makes a man faithful to a woman?

Every man I dated, eventually turned unfaithful to me. I don't understand why.
Do you thing there is an issue in a woman that makes men not staying faithful? Is there a specific characteristic? A trait? A behaviour.
I have never cheated to anyone and always tried to show my man love i had to them instead, even though there have been other men that liked me.
I'll read your opinions with big attention.
What makes a man faithful to a woman?
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