<human>: 19 year old male, with a 19 year old girlfriend. We've been dating for 4 months and I need some advice. I love my girlfriend, but recently we've been having trouble. About two months into our relationship I found out she was talking to her ex and saying how much she missed him and that she wanted to get back together with him. I found out and nearly broke up with her, but she apologized and said she was stupid and she loved me. Recently I found out she was talking to him again, and I got mad at her and asked her to stop. She told me she would, but yesterday I found out she lied to me about talking to him, she screamed at me for doubting her, but finally she told me the truth, that she was talking to him. I don't know what to do. I don't want her talking to him, but she told me that she wouldn't stop talking to him for me. She promises me that there's nothing going on, she just doesn't want to lose a friend. I don't know what to do, so I'm turning to you. I don't want to break up, but I feel that I may just be blinded by my love for her.

Could you distill the essence of the text into 1-3 sentences?
<bot>: Current GF is talking to an ex again, after she promised not to when I found out she was trying to get back together with him.