Should I js leave her?

my girlfriend keeps talking to this one dude i told her i dont like and she still calls him and everything. he calls her love but they still call. she talk about me behind my back and everything. she talks about him a lot and im tired of telling her to stop talking to him. i tried to block her but its not letting me. her mom doesn't let her date anyone and she doesn't know were together. should i js break up with her and tell her mom what she's doing😭

Should I js leave her?
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