Should I break up with her?

My girlfriend is dating another guy. She was with him in a foreign country and then she moved into the country I'm in currently. We met and she says she fell in love with me and we've been together since. She tells me she can't break up with the other guy because she doesn't want to hurt his feelings. She constantly texts him and the exchange love interactions all the time. I really love her but this whole situation is really getting to me. What should I do?, I need help!!!
Should I break up with her?
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