| Well, it may be too late, that's the first thing you have to keep in mind. And also that if you decide to go ahead with it, you may lose her friendship (or at least it won't probably be the same) if she says no, and you may lose your friend's (her ex) friendship if she says yes.
It's easy to say from the outside, but if I were you, I'd go for it. If you don't, you won't ever stop wondering "what if", and it will be hard to move on.
I'm not an expert at all. In fact I'm probably the last one that should be giving you advice, but it's for you to decide if you wanna take it or not. I'd say it's probably too late to game her the way you would game a stranger, it would be awkward. She already knows if you are an alpha male or not, a nice guy or a cocky one, a funny guy... Instead, I would just go direct and sincere, and hope she feels the same way. And if she doesn't, don't take it personally, and move on.
It's just what I think
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