Don't know how to behave towards my ex.

Hi, I broke up with my long distance, ex-girlfriend about 3 weeks ago, we were dating for about 1 year and 6 months. She told me she still wanted to be friends, because she was worried about me and didn't want me to be alone. She initiated the break up. There were no major problems, just one morning she called me and didn't want to be with me due to the distance (I live in England and she lives in the US). We kept on texting and Skyping every now and again and we missed each other. And we both spoke about our feelings for each other. 2 weeks after the break up I found out she was seeing someone from her workplace. And has officially turned into a "relationship". Which hurt a lot. About a week later, she tells me that he doesn't care for her, and that she feels alone without me. She also added that she "didn't want to start with anyone new". As a good friend I reminded the good times we had together, which made her smile. I made it clear to her that I wanted her back, and she knows this. At times we spoke how we used to speak to each other when we were in the the relationship e.g calling each other by our little nicknames we had etc. I asked her if her "boyfriend" knew that we were talking like this and she was sad and said no. Later her "boyfriend" does find out who I am, and tells her to stop talking to me, to which she comes and tells me he is very very very "insecure" about me. They have fights over me "liking" something on her facebook profile and/or instagram. He made her delete me off of instagram and she told me to block him on facebook. After a while, she tells me that they had a fight, we sort of talk about it, and then she says she's "waiting for an excuse to break up" and later my tongue slips and I ask her "If she cares for him" to which she replied with "I don't really..". However at this point she still goes out with him and even stays over. We keep messaging each other "Goodnight" and "Goodmorning" etc, asking how we were etc. A few days later, I message her if she's okay, a while later she replies with "Yes, I'm driving home to change for work..its complicated went out last night...stayed over at a friends house". I replied with "Hope you had fun :)" ..she answered "It hurts to say that doesn't it?". We then discussed our situation and her situation and tells me that she wants to give this guy a "decent chance", she explains that us talking everyday complicates her relationship with this guy, to which I fully understand. She tells me that we should talk less "personally". And I tell her I'll be there for her and catch her if she falls. But she adds that she thinks that his chances of "blowing it are great". To which my heart rejoices. After that she has to leave for work. After she went off work she came home but still messaged me a few times. But..she (I know this is going to sound weird) but she's acting like a "friend" and the closeness we had literally a few hours before seems to be gone. I think she's trying hard to give him a chance. She posted a picture of her with makeup and curled hair smiling and looking very happy. We messaged each other goodnight and she replied "speak to you tommorow" after I told her, that she looked beautiful. I just don't know what do to. I love her to pieces but her giving him another chance really really hurts me. She's been so close to me while we were in the relationship. I've tried to hold myself together, but everyday its a new battle. What should I do? I don't want to loose her. I know he will most likely screw himself because of his selfishness and his controlling nature. Its something she's failing to see right now. But I'm very very afraid.

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