Currently I'm in a relationship but I'm her first love and she's mine but she won't leave the guy she's with what does this mean?

Me and her were together for 2 years and we had recently broke up we stopped talking for about 2 months until we ran back into each other and started talking we are together but she's with someone and won't leave that person should I give in or keep going..
Currently I'm in a relationship but I'm her first love and she's mine but she won't leave the guy she's with what does this mean?
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