Most Helpful Guy
Shes inlove with him.
Clearly this guy got you, while he still had her. So they didn't have a proper break up.
How do you know he's not replying? he could be deleting his end of the text msgs. rofl (probably not the case but you never know)
Anyways. You can't really say anything to her. I don't think she's jealous of you, more so I'm sure she wants to hurt you. (physically)
If you did take this guy while he had her, just know that your robbing someone of their love. And no its not a "whatever sh*t happens" kinda look on things. Its more of a, how would you like it if he did that to you? Which I'm pretty sure he probably will do if he left her for you. (shows he can't be alone, and when he's read to go, he will)
If they had a proper break, she wouldn't be calling him to this day. But for the fact that he jumped to you, which is what I'm guessing, and I'm more then 100% sure that he did. Then this is the outcome you get. Because he couldn't be the mature one and give her proper reasoning as to why and time to heal on both ends.
You will honestly just need to deal with it, until she gives up. That's what I mean by time to heal. She's still in the "chasing" phase of the breakup. Which he did not give her.