Girlfriends always keep close contact with their ex-boyfriends and often call and send text messages. As my boyfriend now, how should I look at this matter?

Love her, you can't just let her go! No woman is born bad, but if you continue like this, she will change! Tell her that there is no room in your world for someone who once loved and abandoned her! If they still have feelings, let them go, there is not so much humble waiting under the sun! Be reasonable, you don't want to share your lover with other men. You must let her and that person know that you have dignity and respect them enough!