<human>: Can you condense the text into a few key points?

I made a post earlier asking you guys if there was too much of an age gap between myself and a 16 year old girl; the general consensus was it's fine and to go for it. So, I went for it. The girl is great; funny, mature, cutely shy. The first thing that pops into my head when I think of her is innocent.

Enter my ex-girlfriend [17F]. Since we broke up almost 2 months ago, she has already found another guy. That's great, I'm happy; except she won't leave my current crush alone. My ex is claiming that she's a bad person because they were friends and she "went for me" (which isn't true, they simply knew who one another were). She's threatening to fight her, punch her in the face, etc. This is the reason she's my ex; she is incredibly immature. 

So, here I am, wondering what I should do about the situation. I told my crush to simply ignore my ex, and she's very understanding about the whole situation. She's not the type to have drama or fight, so it took her off guard. Should I confront my ex? I cut contact with her due to the immaturity she brought to my everyday life, however she states that she misses me, etc. I've made it evident I want nothing to do with her, but I feel that given the circumstances I need to talk to her and tell her to basically cool it. Thoughts?
<bot>: Ex is threatening to fight/punch crush. Crush is innocent, never involved in drama while ex is always full of it. Should I speak to ex or just ignore the entire situation?