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

Hi everyone, so I [22M] have been dating my SO [25F] for around 2.5 years. The relationship got into a bad spot at the end because of her depression and since she was going away for the summer, we decided to go on a break. 
During the course of which I was supposed to date other people. About a month into the summer, she tells me she's dating someone else. A month later, she tells me she's been dating one of her good guy friends [23M], who also happens to be her brother's former best friend and long term family friend. She says she wants to give things with him a chance. 
I miss her terribly and want to see if she would be willing to date both of us at the same time, until she decides if she wants to date one of us exclusively. Although I'm afraid requesting this may result in her not wanting to hangout with me anymore. What do you guys think? 
I don't want to lose her = (
<bot>: Went on a break, ex dating a friend, want to ask if I could date her too or stay friends and wait to see how it goes?