Dating my best friend's ex-boyfriend?
	
	
		My best friend broke up with this guy 1 year and 6 months ago. She broke up with him before they reached 1 month and got back with her ex-boyfriend. I was there when she cheated with him. 
I fell in love with him this summer, he is a great guy and I can't understand why my friend broke up with him. When I told my friend that I am dating him, she said it was okay. But after a week or two, she's not talking to me. She said that being with her ex is awkward and that it was not good dating a best friend's ex boyfriend. 
I hate this feeling, I cannot be happy if I know that I have let someone down.I love my boyfriend, actually he is my first one. And were breaking up because of her, the final decision is mine but I really need help and advices.My best friend and boyfriend are both important to me so I am really having a hard time. Thank you guys