<human>: Can you provide a brief overview of the text?

This is a throwaway account. 

My girlfriend of 6 months is best friends with her ex. She has tried and tried to be with this guy, but nothing has come out from it. She had told me that he was always a better friend than a bf.

He's been there for her during the tough times. He was there when her mother died. He was there when she was in deep trouble. She described him as the most reliable friend she has. 

I know he still has feelings for her and he isn't too fond of me. 

I am not a jealous guy, but I do have to admit that it bothers me. What makes it tolerable is that she is upfront and honest with me about everything she does. We talk about our days on a daily basis.  

I don't like to give ultimatums and I am completely in love with this girl. She is everything I want in a girl. So leaving will be extremely hard.
<bot>: Gf is friends with her Ex Bf. He still has feelings for her, but she only sees him as a friend. I don't want to leave her. Is there a way for this to work?